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Simplifying 3x + 30 = x + 12 Reorder the terms: 30 + 3x = x + 12 Reorder the terms: 30 + 3x = 12 + x Solving 30 + 3x = 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. 30 + 3x + -1x = 12 + x + -1x Combine like terms: 3x + -1x = 2x 30 + 2x = 12 + x + -1x Combine like terms: x + -1x = 0 30 + 2x = 12 + 0 30 + 2x = 12 Add '-30' to each side of the equation. 30 + -30 + 2x = 12 + -30 Combine like terms: 30 + -30 = 0 0 + 2x = 12 + -30 2x = 12 + -30 Combine like terms: 12 + -30 = -18 2x = -18 Divide each side by '2'. x = -9 Simplifying x = -9
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