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Simplifying 3 + 18 = -12x + 21 Combine like terms: 3 + 18 = 21 21 = -12x + 21 Reorder the terms: 21 = 21 + -12x Add '-21' to each side of the equation. 21 + -21 = 21 + -21 + -12x Combine like terms: 21 + -21 = 0 0 = 21 + -21 + -12x Combine like terms: 21 + -21 = 0 0 = 0 + -12x 0 = -12x Solving 0 = -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 0 + 12x = -12x + 12x Remove the zero: 12x = -12x + 12x Combine like terms: -12x + 12x = 0 12x = 0 Divide each side by '12'. x = 0 Simplifying x = 0
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