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Simplifying (4x + -3) + (12x + -9) = 180 Reorder the terms: (-3 + 4x) + (12x + -9) = 180 Remove parenthesis around (-3 + 4x) -3 + 4x + (12x + -9) = 180 Reorder the terms: -3 + 4x + (-9 + 12x) = 180 Remove parenthesis around (-9 + 12x) -3 + 4x + -9 + 12x = 180 Reorder the terms: -3 + -9 + 4x + 12x = 180 Combine like terms: -3 + -9 = -12 -12 + 4x + 12x = 180 Combine like terms: 4x + 12x = 16x -12 + 16x = 180 Solving -12 + 16x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 16x = 180 + 12 Combine like terms: -12 + 12 = 0 0 + 16x = 180 + 12 16x = 180 + 12 Combine like terms: 180 + 12 = 192 16x = 192 Divide each side by '16'. x = 12 Simplifying x = 12
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