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Simplifying (2x + 12) + (2x + 21) = 90 Reorder the terms: (12 + 2x) + (2x + 21) = 90 Remove parenthesis around (12 + 2x) 12 + 2x + (2x + 21) = 90 Reorder the terms: 12 + 2x + (21 + 2x) = 90 Remove parenthesis around (21 + 2x) 12 + 2x + 21 + 2x = 90 Reorder the terms: 12 + 21 + 2x + 2x = 90 Combine like terms: 12 + 21 = 33 33 + 2x + 2x = 90 Combine like terms: 2x + 2x = 4x 33 + 4x = 90 Solving 33 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-33' to each side of the equation. 33 + -33 + 4x = 90 + -33 Combine like terms: 33 + -33 = 0 0 + 4x = 90 + -33 4x = 90 + -33 Combine like terms: 90 + -33 = 57 4x = 57 Divide each side by '4'. x = 14.25 Simplifying x = 14.25
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