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Simplifying 90 + (3x + -5) + (7x + 5) = 180 Reorder the terms: 90 + (-5 + 3x) + (7x + 5) = 180 Remove parenthesis around (-5 + 3x) 90 + -5 + 3x + (7x + 5) = 180 Reorder the terms: 90 + -5 + 3x + (5 + 7x) = 180 Remove parenthesis around (5 + 7x) 90 + -5 + 3x + 5 + 7x = 180 Reorder the terms: 90 + -5 + 5 + 3x + 7x = 180 Combine like terms: 90 + -5 = 85 85 + 5 + 3x + 7x = 180 Combine like terms: 85 + 5 = 90 90 + 3x + 7x = 180 Combine like terms: 3x + 7x = 10x 90 + 10x = 180 Solving 90 + 10x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 10x = 180 + -90 Combine like terms: 90 + -90 = 0 0 + 10x = 180 + -90 10x = 180 + -90 Combine like terms: 180 + -90 = 90 10x = 90 Divide each side by '10'. x = 9 Simplifying x = 9
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