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Simplifying (2x + -21) = 87 Reorder the terms: (-21 + 2x) = 87 Remove parenthesis around (-21 + 2x) -21 + 2x = 87 Solving -21 + 2x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2x = 87 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 87 + 21 2x = 87 + 21 Combine like terms: 87 + 21 = 108 2x = 108 Divide each side by '2'. x = 54 Simplifying x = 54
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