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Simplifying 4x + -1(5x + -12) = 9 Reorder the terms: 4x + -1(-12 + 5x) = 9 4x + (-12 * -1 + 5x * -1) = 9 4x + (12 + -5x) = 9 Reorder the terms: 12 + 4x + -5x = 9 Combine like terms: 4x + -5x = -1x 12 + -1x = 9 Solving 12 + -1x = 9 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 + -1x = 9 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 9 + -12 -1x = 9 + -12 Combine like terms: 9 + -12 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3
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