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Simplifying x + (12 + -1x) + (15 + -1x) + 4 = 20 Remove parenthesis around (12 + -1x) x + 12 + -1x + (15 + -1x) + 4 = 20 Remove parenthesis around (15 + -1x) x + 12 + -1x + 15 + -1x + 4 = 20 Reorder the terms: 12 + 15 + 4 + x + -1x + -1x = 20 Combine like terms: 12 + 15 = 27 27 + 4 + x + -1x + -1x = 20 Combine like terms: 27 + 4 = 31 31 + x + -1x + -1x = 20 Combine like terms: x + -1x = 0 31 + 0 + -1x = 20 31 + -1x = 20 Solving 31 + -1x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-31' to each side of the equation. 31 + -31 + -1x = 20 + -31 Combine like terms: 31 + -31 = 0 0 + -1x = 20 + -31 -1x = 20 + -31 Combine like terms: 20 + -31 = -11 -1x = -11 Divide each side by '-1'. x = 11 Simplifying x = 11
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