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Simplifying 20 = 3(x + -3) + -1(x + -8) Reorder the terms: 20 = 3(-3 + x) + -1(x + -8) 20 = (-3 * 3 + x * 3) + -1(x + -8) 20 = (-9 + 3x) + -1(x + -8) Reorder the terms: 20 = -9 + 3x + -1(-8 + x) 20 = -9 + 3x + (-8 * -1 + x * -1) 20 = -9 + 3x + (8 + -1x) Reorder the terms: 20 = -9 + 8 + 3x + -1x Combine like terms: -9 + 8 = -1 20 = -1 + 3x + -1x Combine like terms: 3x + -1x = 2x 20 = -1 + 2x Solving 20 = -1 + 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. 20 + -2x = -1 + 2x + -2x Combine like terms: 2x + -2x = 0 20 + -2x = -1 + 0 20 + -2x = -1 Add '-20' to each side of the equation. 20 + -20 + -2x = -1 + -20 Combine like terms: 20 + -20 = 0 0 + -2x = -1 + -20 -2x = -1 + -20 Combine like terms: -1 + -20 = -21 -2x = -21 Divide each side by '-2'. x = 10.5 Simplifying x = 10.5
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