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Simplifying 2x + -5(-1x + -9) = 87 Reorder the terms: 2x + -5(-9 + -1x) = 87 2x + (-9 * -5 + -1x * -5) = 87 2x + (45 + 5x) = 87 Reorder the terms: 45 + 2x + 5x = 87 Combine like terms: 2x + 5x = 7x 45 + 7x = 87 Solving 45 + 7x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 7x = 87 + -45 Combine like terms: 45 + -45 = 0 0 + 7x = 87 + -45 7x = 87 + -45 Combine like terms: 87 + -45 = 42 7x = 42 Divide each side by '7'. x = 6 Simplifying x = 6
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