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Simplifying 81 + (2x + 5) = 90 Reorder the terms: 81 + (5 + 2x) = 90 Remove parenthesis around (5 + 2x) 81 + 5 + 2x = 90 Combine like terms: 81 + 5 = 86 86 + 2x = 90 Solving 86 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-86' to each side of the equation. 86 + -86 + 2x = 90 + -86 Combine like terms: 86 + -86 = 0 0 + 2x = 90 + -86 2x = 90 + -86 Combine like terms: 90 + -86 = 4 2x = 4 Divide each side by '2'. x = 2 Simplifying x = 2
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