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Simplifying -7(3x + -9) = -21 Reorder the terms: -7(-9 + 3x) = -21 (-9 * -7 + 3x * -7) = -21 (63 + -21x) = -21 Solving 63 + -21x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -21x = -21 + -63 Combine like terms: 63 + -63 = 0 0 + -21x = -21 + -63 -21x = -21 + -63 Combine like terms: -21 + -63 = -84 -21x = -84 Divide each side by '-21'. x = 4 Simplifying x = 4
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