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Simplifying (21x + -3) + (7x + 9) + (15x + 15) = 180 Reorder the terms: (-3 + 21x) + (7x + 9) + (15x + 15) = 180 Remove parenthesis around (-3 + 21x) -3 + 21x + (7x + 9) + (15x + 15) = 180 Reorder the terms: -3 + 21x + (9 + 7x) + (15x + 15) = 180 Remove parenthesis around (9 + 7x) -3 + 21x + 9 + 7x + (15x + 15) = 180 Reorder the terms: -3 + 21x + 9 + 7x + (15 + 15x) = 180 Remove parenthesis around (15 + 15x) -3 + 21x + 9 + 7x + 15 + 15x = 180 Reorder the terms: -3 + 9 + 15 + 21x + 7x + 15x = 180 Combine like terms: -3 + 9 = 6 6 + 15 + 21x + 7x + 15x = 180 Combine like terms: 6 + 15 = 21 21 + 21x + 7x + 15x = 180 Combine like terms: 21x + 7x = 28x 21 + 28x + 15x = 180 Combine like terms: 28x + 15x = 43x 21 + 43x = 180 Solving 21 + 43x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 43x = 180 + -21 Combine like terms: 21 + -21 = 0 0 + 43x = 180 + -21 43x = 180 + -21 Combine like terms: 180 + -21 = 159 43x = 159 Divide each side by '43'. x = 3.697674419 Simplifying x = 3.697674419
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