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Simplifying 13x + -2(4x + -4) = 72 Reorder the terms: 13x + -2(-4 + 4x) = 72 13x + (-4 * -2 + 4x * -2) = 72 13x + (8 + -8x) = 72 Reorder the terms: 8 + 13x + -8x = 72 Combine like terms: 13x + -8x = 5x 8 + 5x = 72 Solving 8 + 5x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 5x = 72 + -8 Combine like terms: 8 + -8 = 0 0 + 5x = 72 + -8 5x = 72 + -8 Combine like terms: 72 + -8 = 64 5x = 64 Divide each side by '5'. x = 12.8 Simplifying x = 12.8
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