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Simplifying 42 = 12 + x Solving 42 = 12 + 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 = 12 + x + -1x Combine like terms: x + -1x = 0 42 + -1x = 12 + 0 42 + -1x = 12 Add '-42' to each side of the equation. 42 + -42 + -1x = 12 + -42 Combine like terms: 42 + -42 = 0 0 + -1x = 12 + -42 -1x = 12 + -42 Combine like terms: 12 + -42 = -30 -1x = -30 Divide each side by '-1'. x = 30 Simplifying x = 30
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