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Simplifying (7x + -39) = 87 Reorder the terms: (-39 + 7x) = 87 Remove parenthesis around (-39 + 7x) -39 + 7x = 87 Solving -39 + 7x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '39' to each side of the equation. -39 + 39 + 7x = 87 + 39 Combine like terms: -39 + 39 = 0 0 + 7x = 87 + 39 7x = 87 + 39 Combine like terms: 87 + 39 = 126 7x = 126 Divide each side by '7'. x = 18 Simplifying x = 18
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