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Simplifying x + -3(x + -1) = -9 Reorder the terms: x + -3(-1 + x) = -9 x + (-1 * -3 + x * -3) = -9 x + (3 + -3x) = -9 Reorder the terms: 3 + x + -3x = -9 Combine like terms: x + -3x = -2x 3 + -2x = -9 Solving 3 + -2x = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2x = -9 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = -9 + -3 -2x = -9 + -3 Combine like terms: -9 + -3 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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