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Simplifying 42 = 13 + x + 12 Reorder the terms: 42 = 13 + 12 + x Combine like terms: 13 + 12 = 25 42 = 25 + x Solving 42 = 25 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 42 + -1x = 25 + x + -1x Combine like terms: x + -1x = 0 42 + -1x = 25 + 0 42 + -1x = 25 Add '-42' to each side of the equation. 42 + -42 + -1x = 25 + -42 Combine like terms: 42 + -42 = 0 0 + -1x = 25 + -42 -1x = 25 + -42 Combine like terms: 25 + -42 = -17 -1x = -17 Divide each side by '-1'. x = 17 Simplifying x = 17
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