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Simplifying (X + -7) + 12 = 20 Reorder the terms: (-7 + X) + 12 = 20 Remove parenthesis around (-7 + X) -7 + X + 12 = 20 Reorder the terms: -7 + 12 + X = 20 Combine like terms: -7 + 12 = 5 5 + X = 20 Solving 5 + X = 20 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + X = 20 + -5 Combine like terms: 5 + -5 = 0 0 + X = 20 + -5 X = 20 + -5 Combine like terms: 20 + -5 = 15 X = 15 Simplifying X = 15
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