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Simplifying 8 + -1(-1 + -2x) = 7 + x 8 + (-1 * -1 + -2x * -1) = 7 + x 8 + (1 + 2x) = 7 + x Combine like terms: 8 + 1 = 9 9 + 2x = 7 + x Solving 9 + 2x = 7 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 9 + 2x + -1x = 7 + x + -1x Combine like terms: 2x + -1x = 1x 9 + 1x = 7 + x + -1x Combine like terms: x + -1x = 0 9 + 1x = 7 + 0 9 + 1x = 7 Add '-9' to each side of the equation. 9 + -9 + 1x = 7 + -9 Combine like terms: 9 + -9 = 0 0 + 1x = 7 + -9 1x = 7 + -9 Combine like terms: 7 + -9 = -2 1x = -2 Divide each side by '1'. x = -2 Simplifying x = -2
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