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Simplifying x + (x + 9) + (2x + -21) = 180 Reorder the terms: x + (9 + x) + (2x + -21) = 180 Remove parenthesis around (9 + x) x + 9 + x + (2x + -21) = 180 Reorder the terms: x + 9 + x + (-21 + 2x) = 180 Remove parenthesis around (-21 + 2x) x + 9 + x + -21 + 2x = 180 Reorder the terms: 9 + -21 + x + x + 2x = 180 Combine like terms: 9 + -21 = -12 -12 + x + x + 2x = 180 Combine like terms: x + x = 2x -12 + 2x + 2x = 180 Combine like terms: 2x + 2x = 4x -12 + 4x = 180 Solving -12 + 4x = 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 + 4x = 180 + 12 Combine like terms: -12 + 12 = 0 0 + 4x = 180 + 12 4x = 180 + 12 Combine like terms: 180 + 12 = 192 4x = 192 Divide each side by '4'. x = 48 Simplifying x = 48
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