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Simplifying (3x + 18) + 90 + (4x + -12) = 180 Reorder the terms: (18 + 3x) + 90 + (4x + -12) = 180 Remove parenthesis around (18 + 3x) 18 + 3x + 90 + (4x + -12) = 180 Reorder the terms: 18 + 3x + 90 + (-12 + 4x) = 180 Remove parenthesis around (-12 + 4x) 18 + 3x + 90 + -12 + 4x = 180 Reorder the terms: 18 + 90 + -12 + 3x + 4x = 180 Combine like terms: 18 + 90 = 108 108 + -12 + 3x + 4x = 180 Combine like terms: 108 + -12 = 96 96 + 3x + 4x = 180 Combine like terms: 3x + 4x = 7x 96 + 7x = 180 Solving 96 + 7x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-96' to each side of the equation. 96 + -96 + 7x = 180 + -96 Combine like terms: 96 + -96 = 0 0 + 7x = 180 + -96 7x = 180 + -96 Combine like terms: 180 + -96 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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