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Simplifying 12 + x = 42 + 2x Solving 12 + x = 42 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 12 + x + -2x = 42 + 2x + -2x Combine like terms: x + -2x = -1x 12 + -1x = 42 + 2x + -2x Combine like terms: 2x + -2x = 0 12 + -1x = 42 + 0 12 + -1x = 42 Add '-12' to each side of the equation. 12 + -12 + -1x = 42 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 42 + -12 -1x = 42 + -12 Combine like terms: 42 + -12 = 30 -1x = 30 Divide each side by '-1'. x = -30 Simplifying x = -30
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