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Simplifying (30 + -1x) + x + (25 + -1x) = 42 Remove parenthesis around (30 + -1x) 30 + -1x + x + (25 + -1x) = 42 Remove parenthesis around (25 + -1x) 30 + -1x + x + 25 + -1x = 42 Reorder the terms: 30 + 25 + -1x + x + -1x = 42 Combine like terms: 30 + 25 = 55 55 + -1x + x + -1x = 42 Combine like terms: -1x + x = 0 55 + 0 + -1x = 42 55 + -1x = 42 Solving 55 + -1x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-55' to each side of the equation. 55 + -55 + -1x = 42 + -55 Combine like terms: 55 + -55 = 0 0 + -1x = 42 + -55 -1x = 42 + -55 Combine like terms: 42 + -55 = -13 -1x = -13 Divide each side by '-1'. x = 13 Simplifying x = 13
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