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Simplifying 5(x + 4) + 2(x + -8) = 90 Reorder the terms: 5(4 + x) + 2(x + -8) = 90 (4 * 5 + x * 5) + 2(x + -8) = 90 (20 + 5x) + 2(x + -8) = 90 Reorder the terms: 20 + 5x + 2(-8 + x) = 90 20 + 5x + (-8 * 2 + x * 2) = 90 20 + 5x + (-16 + 2x) = 90 Reorder the terms: 20 + -16 + 5x + 2x = 90 Combine like terms: 20 + -16 = 4 4 + 5x + 2x = 90 Combine like terms: 5x + 2x = 7x 4 + 7x = 90 Solving 4 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7x = 90 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 90 + -4 7x = 90 + -4 Combine like terms: 90 + -4 = 86 7x = 86 Divide each side by '7'. x = 12.28571429 Simplifying x = 12.28571429
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