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Simplifying 20 = 4(x + -3) + -1(x + -8) Reorder the terms: 20 = 4(-3 + x) + -1(x + -8) 20 = (-3 * 4 + x * 4) + -1(x + -8) 20 = (-12 + 4x) + -1(x + -8) Reorder the terms: 20 = -12 + 4x + -1(-8 + x) 20 = -12 + 4x + (-8 * -1 + x * -1) 20 = -12 + 4x + (8 + -1x) Reorder the terms: 20 = -12 + 8 + 4x + -1x Combine like terms: -12 + 8 = -4 20 = -4 + 4x + -1x Combine like terms: 4x + -1x = 3x 20 = -4 + 3x Solving 20 = -4 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 20 + -3x = -4 + 3x + -3x Combine like terms: 3x + -3x = 0 20 + -3x = -4 + 0 20 + -3x = -4 Add '-20' to each side of the equation. 20 + -20 + -3x = -4 + -20 Combine like terms: 20 + -20 = 0 0 + -3x = -4 + -20 -3x = -4 + -20 Combine like terms: -4 + -20 = -24 -3x = -24 Divide each side by '-3'. x = 8 Simplifying x = 8
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