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Simplifying 7 = 4(x + -4) + -1(x + -8) Reorder the terms: 7 = 4(-4 + x) + -1(x + -8) 7 = (-4 * 4 + x * 4) + -1(x + -8) 7 = (-16 + 4x) + -1(x + -8) Reorder the terms: 7 = -16 + 4x + -1(-8 + x) 7 = -16 + 4x + (-8 * -1 + x * -1) 7 = -16 + 4x + (8 + -1x) Reorder the terms: 7 = -16 + 8 + 4x + -1x Combine like terms: -16 + 8 = -8 7 = -8 + 4x + -1x Combine like terms: 4x + -1x = 3x 7 = -8 + 3x Solving 7 = -8 + 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. 7 + -3x = -8 + 3x + -3x Combine like terms: 3x + -3x = 0 7 + -3x = -8 + 0 7 + -3x = -8 Add '-7' to each side of the equation. 7 + -7 + -3x = -8 + -7 Combine like terms: 7 + -7 = 0 0 + -3x = -8 + -7 -3x = -8 + -7 Combine like terms: -8 + -7 = -15 -3x = -15 Divide each side by '-3'. x = 5 Simplifying x = 5
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