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Simplifying -7(3x + -1) = -140 Reorder the terms: -7(-1 + 3x) = -140 (-1 * -7 + 3x * -7) = -140 (7 + -21x) = -140 Solving 7 + -21x = -140 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -21x = -140 + -7 Combine like terms: 7 + -7 = 0 0 + -21x = -140 + -7 -21x = -140 + -7 Combine like terms: -140 + -7 = -147 -21x = -147 Divide each side by '-21'. x = 7 Simplifying x = 7
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