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Simplifying -3x + -12 = 21 Reorder the terms: -12 + -3x = 21 Solving -12 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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 = 33 -3x = 33 Divide each side by '-3'. x = -11 Simplifying x = -11
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