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Simplifying -9(-1 + 10x) + -7 = -1(-2 + -2x) (-1 * -9 + 10x * -9) + -7 = -1(-2 + -2x) (9 + -90x) + -7 = -1(-2 + -2x) Reorder the terms: 9 + -7 + -90x = -1(-2 + -2x) Combine like terms: 9 + -7 = 2 2 + -90x = -1(-2 + -2x) 2 + -90x = (-2 * -1 + -2x * -1) 2 + -90x = (2 + 2x) Add '-2' to each side of the equation. 2 + -2 + -90x = 2 + -2 + 2x Combine like terms: 2 + -2 = 0 0 + -90x = 2 + -2 + 2x -90x = 2 + -2 + 2x Combine like terms: 2 + -2 = 0 -90x = 0 + 2x -90x = 2x Solving -90x = 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -90x + -2x = 2x + -2x Combine like terms: -90x + -2x = -92x -92x = 2x + -2x Combine like terms: 2x + -2x = 0 -92x = 0 Divide each side by '-92'. x = 0 Simplifying x = 0
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