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Simplifying 7x + (2x + -9) = 180 Reorder the terms: 7x + (-9 + 2x) = 180 Remove parenthesis around (-9 + 2x) 7x + -9 + 2x = 180 Reorder the terms: -9 + 7x + 2x = 180 Combine like terms: 7x + 2x = 9x -9 + 9x = 180 Solving -9 + 9x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 9x = 180 + 9 Combine like terms: -9 + 9 = 0 0 + 9x = 180 + 9 9x = 180 + 9 Combine like terms: 180 + 9 = 189 9x = 189 Divide each side by '9'. x = 21 Simplifying x = 21
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