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Simplifying -231 = -7(8 + -3x) + -7 -231 = (8 * -7 + -3x * -7) + -7 -231 = (-56 + 21x) + -7 Reorder the terms: -231 = -56 + -7 + 21x Combine like terms: -56 + -7 = -63 -231 = -63 + 21x Solving -231 = -63 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -231 + -21x = -63 + 21x + -21x Combine like terms: 21x + -21x = 0 -231 + -21x = -63 + 0 -231 + -21x = -63 Add '231' to each side of the equation. -231 + 231 + -21x = -63 + 231 Combine like terms: -231 + 231 = 0 0 + -21x = -63 + 231 -21x = -63 + 231 Combine like terms: -63 + 231 = 168 -21x = 168 Divide each side by '-21'. x = -8 Simplifying x = -8
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