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Simplifying (2x + 9) = (3x + -21) Reorder the terms: (9 + 2x) = (3x + -21) Remove parenthesis around (9 + 2x) 9 + 2x = (3x + -21) Reorder the terms: 9 + 2x = (-21 + 3x) Remove parenthesis around (-21 + 3x) 9 + 2x = -21 + 3x Solving 9 + 2x = -21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 9 + 2x + -3x = -21 + 3x + -3x Combine like terms: 2x + -3x = -1x 9 + -1x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 9 + -1x = -21 + 0 9 + -1x = -21 Add '-9' to each side of the equation. 9 + -9 + -1x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = -21 + -9 -1x = -21 + -9 Combine like terms: -21 + -9 = -30 -1x = -30 Divide each side by '-1'. x = 30 Simplifying x = 30
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