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Simplifying -7(3x + -9) = 315 Reorder the terms: -7(-9 + 3x) = 315 (-9 * -7 + 3x * -7) = 315 (63 + -21x) = 315 Solving 63 + -21x = 315 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 = 315 + -63 Combine like terms: 63 + -63 = 0 0 + -21x = 315 + -63 -21x = 315 + -63 Combine like terms: 315 + -63 = 252 -21x = 252 Divide each side by '-21'. x = -12 Simplifying x = -12
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