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Simplifying 2x + 21 + 7x + -3 + 90 = 180 Reorder the terms: 21 + -3 + 90 + 2x + 7x = 180 Combine like terms: 21 + -3 = 18 18 + 90 + 2x + 7x = 180 Combine like terms: 18 + 90 = 108 108 + 2x + 7x = 180 Combine like terms: 2x + 7x = 9x 108 + 9x = 180 Solving 108 + 9x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-108' to each side of the equation. 108 + -108 + 9x = 180 + -108 Combine like terms: 108 + -108 = 0 0 + 9x = 180 + -108 9x = 180 + -108 Combine like terms: 180 + -108 = 72 9x = 72 Divide each side by '9'. x = 8 Simplifying x = 8
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