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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 = 42 2x = 42 Divide each side by '2'. x = 21 Simplifying x = 21
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