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Simplifying 12 = -2(x + -4) + 9 Reorder the terms: 12 = -2(-4 + x) + 9 12 = (-4 * -2 + x * -2) + 9 12 = (8 + -2x) + 9 Reorder the terms: 12 = 8 + 9 + -2x Combine like terms: 8 + 9 = 17 12 = 17 + -2x Solving 12 = 17 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 12 + 2x = 17 + -2x + 2x Combine like terms: -2x + 2x = 0 12 + 2x = 17 + 0 12 + 2x = 17 Add '-12' to each side of the equation. 12 + -12 + 2x = 17 + -12 Combine like terms: 12 + -12 = 0 0 + 2x = 17 + -12 2x = 17 + -12 Combine like terms: 17 + -12 = 5 2x = 5 Divide each side by '2'. x = 2.5 Simplifying x = 2.5
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