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Simplifying x + 21 + 2x + -9 = 90 Reorder the terms: 21 + -9 + x + 2x = 90 Combine like terms: 21 + -9 = 12 12 + x + 2x = 90 Combine like terms: x + 2x = 3x 12 + 3x = 90 Solving 12 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = 90 + -12 3x = 90 + -12 Combine like terms: 90 + -12 = 78 3x = 78 Divide each side by '3'. x = 26 Simplifying x = 26
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