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Simplifying (42 + x) + 2x + 90 = 180 Remove parenthesis around (42 + x) 42 + x + 2x + 90 = 180 Reorder the terms: 42 + 90 + x + 2x = 180 Combine like terms: 42 + 90 = 132 132 + x + 2x = 180 Combine like terms: x + 2x = 3x 132 + 3x = 180 Solving 132 + 3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-132' to each side of the equation. 132 + -132 + 3x = 180 + -132 Combine like terms: 132 + -132 = 0 0 + 3x = 180 + -132 3x = 180 + -132 Combine like terms: 180 + -132 = 48 3x = 48 Divide each side by '3'. x = 16 Simplifying x = 16
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