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Simplifying 6x + (x + -9) = 180 Reorder the terms: 6x + (-9 + x) = 180 Remove parenthesis around (-9 + x) 6x + -9 + x = 180 Reorder the terms: -9 + 6x + x = 180 Combine like terms: 6x + x = 7x -9 + 7x = 180 Solving -9 + 7x = 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 + 7x = 180 + 9 Combine like terms: -9 + 9 = 0 0 + 7x = 180 + 9 7x = 180 + 9 Combine like terms: 180 + 9 = 189 7x = 189 Divide each side by '7'. x = 27 Simplifying x = 27
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