WEBVTT

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Here is the problem: 8x plus 8 equals negative 18.

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A linear equation in x: isolate x using inverse operations.

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Start with the equation.

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Subtract 8 from both sides.

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Divide both sides by 8.

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So the answer is x equals negative 13 over 4 approximately negative 3.25.

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Doing the same operation to both sides keeps the equation balanced. Undoing addition, then multiplication, leaves x alone.

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