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Simplifying (13x + 2) + (5x + -7) + (3x + -4) = 180 Reorder the terms: (2 + 13x) + (5x + -7) + (3x + -4) = 180 Remove parenthesis around (2 + 13x) 2 + 13x + (5x + -7) + (3x + -4) = 180 Reorder the terms: 2 + 13x + (-7 + 5x) + (3x + -4) = 180 Remove parenthesis around (-7 + 5x) 2 + 13x + -7 + 5x + (3x + -4) = 180 Reorder the terms: 2 + 13x + -7 + 5x + (-4 + 3x) = 180 Remove parenthesis around (-4 + 3x) 2 + 13x + -7 + 5x + -4 + 3x = 180 Reorder the terms: 2 + -7 + -4 + 13x + 5x + 3x = 180 Combine like terms: 2 + -7 = -5 -5 + -4 + 13x + 5x + 3x = 180 Combine like terms: -5 + -4 = -9 -9 + 13x + 5x + 3x = 180 Combine like terms: 13x + 5x = 18x -9 + 18x + 3x = 180 Combine like terms: 18x + 3x = 21x -9 + 21x = 180 Solving -9 + 21x = 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 + 21x = 180 + 9 Combine like terms: -9 + 9 = 0 0 + 21x = 180 + 9 21x = 180 + 9 Combine like terms: 180 + 9 = 189 21x = 189 Divide each side by '21'. x = 9 Simplifying x = 9
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