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Simplifying -1(x + 3) = 9x + 7 Reorder the terms: -1(3 + x) = 9x + 7 (3 * -1 + x * -1) = 9x + 7 (-3 + -1x) = 9x + 7 Reorder the terms: -3 + -1x = 7 + 9x Solving -3 + -1x = 7 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -3 + -1x + -9x = 7 + 9x + -9x Combine like terms: -1x + -9x = -10x -3 + -10x = 7 + 9x + -9x Combine like terms: 9x + -9x = 0 -3 + -10x = 7 + 0 -3 + -10x = 7 Add '3' to each side of the equation. -3 + 3 + -10x = 7 + 3 Combine like terms: -3 + 3 = 0 0 + -10x = 7 + 3 -10x = 7 + 3 Combine like terms: 7 + 3 = 10 -10x = 10 Divide each side by '-10'. x = -1 Simplifying x = -1
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