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Simplifying 72 = -2(8x + 7) + 5(1 + -1x) Reorder the terms: 72 = -2(7 + 8x) + 5(1 + -1x) 72 = (7 * -2 + 8x * -2) + 5(1 + -1x) 72 = (-14 + -16x) + 5(1 + -1x) 72 = -14 + -16x + (1 * 5 + -1x * 5) 72 = -14 + -16x + (5 + -5x) Reorder the terms: 72 = -14 + 5 + -16x + -5x Combine like terms: -14 + 5 = -9 72 = -9 + -16x + -5x Combine like terms: -16x + -5x = -21x 72 = -9 + -21x Solving 72 = -9 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 72 + 21x = -9 + -21x + 21x Combine like terms: -21x + 21x = 0 72 + 21x = -9 + 0 72 + 21x = -9 Add '-72' to each side of the equation. 72 + -72 + 21x = -9 + -72 Combine like terms: 72 + -72 = 0 0 + 21x = -9 + -72 21x = -9 + -72 Combine like terms: -9 + -72 = -81 21x = -81 Divide each side by '21'. x = -3.857142857 Simplifying x = -3.857142857
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