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Simplifying -3(7x + -3) = -12 Reorder the terms: -3(-3 + 7x) = -12 (-3 * -3 + 7x * -3) = -12 (9 + -21x) = -12 Solving 9 + -21x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -21x = -12 + -9 Combine like terms: 9 + -9 = 0 0 + -21x = -12 + -9 -21x = -12 + -9 Combine like terms: -12 + -9 = -21 -21x = -21 Divide each side by '-21'. x = 1 Simplifying x = 1
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