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Simplifying (7x + -9) + (5x + 45) = 180 Reorder the terms: (-9 + 7x) + (5x + 45) = 180 Remove parenthesis around (-9 + 7x) -9 + 7x + (5x + 45) = 180 Reorder the terms: -9 + 7x + (45 + 5x) = 180 Remove parenthesis around (45 + 5x) -9 + 7x + 45 + 5x = 180 Reorder the terms: -9 + 45 + 7x + 5x = 180 Combine like terms: -9 + 45 = 36 36 + 7x + 5x = 180 Combine like terms: 7x + 5x = 12x 36 + 12x = 180 Solving 36 + 12x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 12x = 180 + -36 Combine like terms: 36 + -36 = 0 0 + 12x = 180 + -36 12x = 180 + -36 Combine like terms: 180 + -36 = 144 12x = 144 Divide each side by '12'. x = 12 Simplifying x = 12
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