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Simplifying x + (x + -21) + (x + 9) = 156 Reorder the terms: x + (-21 + x) + (x + 9) = 156 Remove parenthesis around (-21 + x) x + -21 + x + (x + 9) = 156 Reorder the terms: x + -21 + x + (9 + x) = 156 Remove parenthesis around (9 + x) x + -21 + x + 9 + x = 156 Reorder the terms: -21 + 9 + x + x + x = 156 Combine like terms: -21 + 9 = -12 -12 + x + x + x = 156 Combine like terms: x + x = 2x -12 + 2x + x = 156 Combine like terms: 2x + x = 3x -12 + 3x = 156 Solving -12 + 3x = 156 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 + 3x = 156 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = 156 + 12 3x = 156 + 12 Combine like terms: 156 + 12 = 168 3x = 168 Divide each side by '3'. x = 56 Simplifying x = 56
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