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