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Simplifying 51 = 2x + (x + -12) Reorder the terms: 51 = 2x + (-12 + x) Remove parenthesis around (-12 + x) 51 = 2x + -12 + x Reorder the terms: 51 = -12 + 2x + x Combine like terms: 2x + x = 3x 51 = -12 + 3x Solving 51 = -12 + 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. 51 + -3x = -12 + 3x + -3x Combine like terms: 3x + -3x = 0 51 + -3x = -12 + 0 51 + -3x = -12 Add '-51' to each side of the equation. 51 + -51 + -3x = -12 + -51 Combine like terms: 51 + -51 = 0 0 + -3x = -12 + -51 -3x = -12 + -51 Combine like terms: -12 + -51 = -63 -3x = -63 Divide each side by '-3'. x = 21 Simplifying x = 21
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