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Simplifying (2x + 12) = 90 Reorder the terms: (12 + 2x) = 90 Remove parenthesis around (12 + 2x) 12 + 2x = 90 Solving 12 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 2x = 90 + -12 2x = 90 + -12 Combine like terms: 90 + -12 = 78 2x = 78 Divide each side by '2'. x = 39 Simplifying x = 39
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