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Simplifying 18x + -7(5 + -3x) = -87 18x + (5 * -7 + -3x * -7) = -87 18x + (-35 + 21x) = -87 Reorder the terms: -35 + 18x + 21x = -87 Combine like terms: 18x + 21x = 39x -35 + 39x = -87 Solving -35 + 39x = -87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + 39x = -87 + 35 Combine like terms: -35 + 35 = 0 0 + 39x = -87 + 35 39x = -87 + 35 Combine like terms: -87 + 35 = -52 39x = -52 Divide each side by '39'. x = -1.333333333 Simplifying x = -1.333333333
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