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Simplifying 90 + x + (2x + 21) = 180 Reorder the terms: 90 + x + (21 + 2x) = 180 Remove parenthesis around (21 + 2x) 90 + x + 21 + 2x = 180 Reorder the terms: 90 + 21 + x + 2x = 180 Combine like terms: 90 + 21 = 111 111 + x + 2x = 180 Combine like terms: x + 2x = 3x 111 + 3x = 180 Solving 111 + 3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-111' to each side of the equation. 111 + -111 + 3x = 180 + -111 Combine like terms: 111 + -111 = 0 0 + 3x = 180 + -111 3x = 180 + -111 Combine like terms: 180 + -111 = 69 3x = 69 Divide each side by '3'. x = 23 Simplifying x = 23
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