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Linear equationsAlgebraMiddle schoolabout 0:44

Solve for x: 8x + 8 = -18: animated lesson

A narrated, step-by-step linear equations video lesson with captions. Final answer: x = -13/4 ≈ -3.25.

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Video with a synthetic English voice and captions. Pick another language for subtitles in that language, or open the interactive version.

Video narrated by a synthetic voice (Piper TTS, en_US-ljspeech-high voice (LJ Speech dataset, public domain)); the steps come from our maths engine and the answer was checked independently. Download MP4 (0.3 MB) · Captions (WebVTT)

Steps on screen

1. The problem
Solving an equation
$8~ x+8 = -18$
2. Step by step
1. $8~ x+8 = -18$
  Start with the equation
2. $8x = -26$
  Subtract 8 from both sides
3. $x = \frac{-26}{8} = -\frac{13}{4}$
  Divide both sides by 8
3. The answer
$x = -\frac{13}{4} \approx -3.25$
x = -13/4 ≈ -3.25
4. Check
- x = -3.25: left side = -18, right side = -18 ✓

Transcript

The problem. Here is the problem: 8x plus 8 equals negative 18. A linear equation in x: isolate x using inverse operations.

Step by step. Start with the equation. Subtract 8 from both sides. Divide both sides by 8.

The answer. So the answer is x equals negative 13 over 4 approximately negative 3.25. Doing the same operation to both sides keeps the equation balanced. Undoing addition, then multiplication, leaves x alone.

Check. x equals negative 3.25: left side equals negative 18, right side equals negative 18, which checks out.

About linear equations

Solve one-variable linear equations, including ones with brackets and fractions, and check the solution.

Solve for x: 8x + 8 = -18: Animated Step-by-Step Lesson