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Simplifying (6x + 7) + (13x + 21) = 180 Reorder the terms: (7 + 6x) + (13x + 21) = 180 Remove parenthesis around (7 + 6x) 7 + 6x + (13x + 21) = 180 Reorder the terms: 7 + 6x + (21 + 13x) = 180 Remove parenthesis around (21 + 13x) 7 + 6x + 21 + 13x = 180 Reorder the terms: 7 + 21 + 6x + 13x = 180 Combine like terms: 7 + 21 = 28 28 + 6x + 13x = 180 Combine like terms: 6x + 13x = 19x 28 + 19x = 180 Solving 28 + 19x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 19x = 180 + -28 Combine like terms: 28 + -28 = 0 0 + 19x = 180 + -28 19x = 180 + -28 Combine like terms: 180 + -28 = 152 19x = 152 Divide each side by '19'. x = 8 Simplifying x = 8
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