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Simplifying (7x + -1) + (2x + 1) = 180 Reorder the terms: (-1 + 7x) + (2x + 1) = 180 Remove parenthesis around (-1 + 7x) -1 + 7x + (2x + 1) = 180 Reorder the terms: -1 + 7x + (1 + 2x) = 180 Remove parenthesis around (1 + 2x) -1 + 7x + 1 + 2x = 180 Reorder the terms: -1 + 1 + 7x + 2x = 180 Combine like terms: -1 + 1 = 0 0 + 7x + 2x = 180 7x + 2x = 180 Combine like terms: 7x + 2x = 9x 9x = 180 Solving 9x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '9'. x = 20 Simplifying x = 20
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