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Simplifying (x + 21) + (2x + 90) = 90 Reorder the terms: (21 + x) + (2x + 90) = 90 Remove parenthesis around (21 + x) 21 + x + (2x + 90) = 90 Reorder the terms: 21 + x + (90 + 2x) = 90 Remove parenthesis around (90 + 2x) 21 + x + 90 + 2x = 90 Reorder the terms: 21 + 90 + x + 2x = 90 Combine like terms: 21 + 90 = 111 111 + x + 2x = 90 Combine like terms: x + 2x = 3x 111 + 3x = 90 Solving 111 + 3x = 90 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 = 90 + -111 Combine like terms: 111 + -111 = 0 0 + 3x = 90 + -111 3x = 90 + -111 Combine like terms: 90 + -111 = -21 3x = -21 Divide each side by '3'. x = -7 Simplifying x = -7
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