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Simplifying 9x + -1(x + -12) = -13 Reorder the terms: 9x + -1(-12 + x) = -13 9x + (-12 * -1 + x * -1) = -13 9x + (12 + -1x) = -13 Reorder the terms: 12 + 9x + -1x = -13 Combine like terms: 9x + -1x = 8x 12 + 8x = -13 Solving 12 + 8x = -13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 8x = -13 + -12 Combine like terms: 12 + -12 = 0 0 + 8x = -13 + -12 8x = -13 + -12 Combine like terms: -13 + -12 = -25 8x = -25 Divide each side by '8'. x = -3.125 Simplifying x = -3.125
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