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Simplifying 15 = x + 42 Reorder the terms: 15 = 42 + x Solving 15 = 42 + 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. 15 + -1x = 42 + x + -1x Combine like terms: x + -1x = 0 15 + -1x = 42 + 0 15 + -1x = 42 Add '-15' to each side of the equation. 15 + -15 + -1x = 42 + -15 Combine like terms: 15 + -15 = 0 0 + -1x = 42 + -15 -1x = 42 + -15 Combine like terms: 42 + -15 = 27 -1x = 27 Divide each side by '-1'. x = -27 Simplifying x = -27
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