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Simplifying 12 = -3x + 21 Reorder the terms: 12 = 21 + -3x Solving 12 = 21 + -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 + 3x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 12 + 3x = 21 + 0 12 + 3x = 21 Add '-12' to each side of the equation. 12 + -12 + 3x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = 21 + -12 3x = 21 + -12 Combine like terms: 21 + -12 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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