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Simplifying -3(x + -9) = x + 7 Reorder the terms: -3(-9 + x) = x + 7 (-9 * -3 + x * -3) = x + 7 (27 + -3x) = x + 7 Reorder the terms: 27 + -3x = 7 + x Solving 27 + -3x = 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. 27 + -3x + -1x = 7 + x + -1x Combine like terms: -3x + -1x = -4x 27 + -4x = 7 + x + -1x Combine like terms: x + -1x = 0 27 + -4x = 7 + 0 27 + -4x = 7 Add '-27' to each side of the equation. 27 + -27 + -4x = 7 + -27 Combine like terms: 27 + -27 = 0 0 + -4x = 7 + -27 -4x = 7 + -27 Combine like terms: 7 + -27 = -20 -4x = -20 Divide each side by '-4'. x = 5 Simplifying x = 5
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