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Simplifying 2x + 5x + -1 + 90 = 180 Reorder the terms: -1 + 90 + 2x + 5x = 180 Combine like terms: -1 + 90 = 89 89 + 2x + 5x = 180 Combine like terms: 2x + 5x = 7x 89 + 7x = 180 Solving 89 + 7x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-89' to each side of the equation. 89 + -89 + 7x = 180 + -89 Combine like terms: 89 + -89 = 0 0 + 7x = 180 + -89 7x = 180 + -89 Combine like terms: 180 + -89 = 91 7x = 91 Divide each side by '7'. x = 13 Simplifying x = 13
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