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Simplifying (2x + 3) + (4x + 12) = 90 Reorder the terms: (3 + 2x) + (4x + 12) = 90 Remove parenthesis around (3 + 2x) 3 + 2x + (4x + 12) = 90 Reorder the terms: 3 + 2x + (12 + 4x) = 90 Remove parenthesis around (12 + 4x) 3 + 2x + 12 + 4x = 90 Reorder the terms: 3 + 12 + 2x + 4x = 90 Combine like terms: 3 + 12 = 15 15 + 2x + 4x = 90 Combine like terms: 2x + 4x = 6x 15 + 6x = 90 Solving 15 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 6x = 90 + -15 Combine like terms: 15 + -15 = 0 0 + 6x = 90 + -15 6x = 90 + -15 Combine like terms: 90 + -15 = 75 6x = 75 Divide each side by '6'. x = 12.5 Simplifying x = 12.5
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