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Simplifying x + -12 = 30 + 3x Reorder the terms: -12 + x = 30 + 3x Solving -12 + x = 30 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -12 + x + -3x = 30 + 3x + -3x Combine like terms: x + -3x = -2x -12 + -2x = 30 + 3x + -3x Combine like terms: 3x + -3x = 0 -12 + -2x = 30 + 0 -12 + -2x = 30 Add '12' to each side of the equation. -12 + 12 + -2x = 30 + 12 Combine like terms: -12 + 12 = 0 0 + -2x = 30 + 12 -2x = 30 + 12 Combine like terms: 30 + 12 = 42 -2x = 42 Divide each side by '-2'. x = -21 Simplifying x = -21
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