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Simplifying x + (x + -12) = 18 Reorder the terms: x + (-12 + x) = 18 Remove parenthesis around (-12 + x) x + -12 + x = 18 Reorder the terms: -12 + x + x = 18 Combine like terms: x + x = 2x -12 + 2x = 18 Solving -12 + 2x = 18 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 + 2x = 18 + 12 Combine like terms: -12 + 12 = 0 0 + 2x = 18 + 12 2x = 18 + 12 Combine like terms: 18 + 12 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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