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Simplifying 12x + -1(4x + -9) = 65 Reorder the terms: 12x + -1(-9 + 4x) = 65 12x + (-9 * -1 + 4x * -1) = 65 12x + (9 + -4x) = 65 Reorder the terms: 9 + 12x + -4x = 65 Combine like terms: 12x + -4x = 8x 9 + 8x = 65 Solving 9 + 8x = 65 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 8x = 65 + -9 Combine like terms: 9 + -9 = 0 0 + 8x = 65 + -9 8x = 65 + -9 Combine like terms: 65 + -9 = 56 8x = 56 Divide each side by '8'. x = 7 Simplifying x = 7
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