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Simplifying (7x + 31) + (21x + -19) = 180 Reorder the terms: (31 + 7x) + (21x + -19) = 180 Remove parenthesis around (31 + 7x) 31 + 7x + (21x + -19) = 180 Reorder the terms: 31 + 7x + (-19 + 21x) = 180 Remove parenthesis around (-19 + 21x) 31 + 7x + -19 + 21x = 180 Reorder the terms: 31 + -19 + 7x + 21x = 180 Combine like terms: 31 + -19 = 12 12 + 7x + 21x = 180 Combine like terms: 7x + 21x = 28x 12 + 28x = 180 Solving 12 + 28x = 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 + 28x = 180 + -12 Combine like terms: 12 + -12 = 0 0 + 28x = 180 + -12 28x = 180 + -12 Combine like terms: 180 + -12 = 168 28x = 168 Divide each side by '28'. x = 6 Simplifying x = 6
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