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Simplifying 15(12 + -2x) + 5(9 + -2x) = 625 (12 * 15 + -2x * 15) + 5(9 + -2x) = 625 (180 + -30x) + 5(9 + -2x) = 625 180 + -30x + (9 * 5 + -2x * 5) = 625 180 + -30x + (45 + -10x) = 625 Reorder the terms: 180 + 45 + -30x + -10x = 625 Combine like terms: 180 + 45 = 225 225 + -30x + -10x = 625 Combine like terms: -30x + -10x = -40x 225 + -40x = 625 Solving 225 + -40x = 625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-225' to each side of the equation. 225 + -225 + -40x = 625 + -225 Combine like terms: 225 + -225 = 0 0 + -40x = 625 + -225 -40x = 625 + -225 Combine like terms: 625 + -225 = 400 -40x = 400 Divide each side by '-40'. x = -10 Simplifying x = -10
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