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Simplifying 15 = 2x + 5(x + -4) Reorder the terms: 15 = 2x + 5(-4 + x) 15 = 2x + (-4 * 5 + x * 5) 15 = 2x + (-20 + 5x) Reorder the terms: 15 = -20 + 2x + 5x Combine like terms: 2x + 5x = 7x 15 = -20 + 7x Solving 15 = -20 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 15 + -7x = -20 + 7x + -7x Combine like terms: 7x + -7x = 0 15 + -7x = -20 + 0 15 + -7x = -20 Add '-15' to each side of the equation. 15 + -15 + -7x = -20 + -15 Combine like terms: 15 + -15 = 0 0 + -7x = -20 + -15 -7x = -20 + -15 Combine like terms: -20 + -15 = -35 -7x = -35 Divide each side by '-7'. x = 5 Simplifying x = 5
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