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Simplifying 30 + x = 2x + 12 Reorder the terms: 30 + x = 12 + 2x Solving 30 + x = 12 + 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. 30 + x + -2x = 12 + 2x + -2x Combine like terms: x + -2x = -1x 30 + -1x = 12 + 2x + -2x Combine like terms: 2x + -2x = 0 30 + -1x = 12 + 0 30 + -1x = 12 Add '-30' to each side of the equation. 30 + -30 + -1x = 12 + -30 Combine like terms: 30 + -30 = 0 0 + -1x = 12 + -30 -1x = 12 + -30 Combine like terms: 12 + -30 = -18 -1x = -18 Divide each side by '-1'. x = 18 Simplifying x = 18
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