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Simplifying 7x + 3(-4x + 5) = -15 Reorder the terms: 7x + 3(5 + -4x) = -15 7x + (5 * 3 + -4x * 3) = -15 7x + (15 + -12x) = -15 Reorder the terms: 15 + 7x + -12x = -15 Combine like terms: 7x + -12x = -5x 15 + -5x = -15 Solving 15 + -5x = -15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -5x = -15 + -15 Combine like terms: 15 + -15 = 0 0 + -5x = -15 + -15 -5x = -15 + -15 Combine like terms: -15 + -15 = -30 -5x = -30 Divide each side by '-5'. x = 6 Simplifying x = 6
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