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Simplifying -7(1x + -1) = -21 Reorder the terms: -7(-1 + 1x) = -21 (-1 * -7 + 1x * -7) = -21 (7 + -7x) = -21 Solving 7 + -7x = -21 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 + -7x = -21 + -7 Combine like terms: 7 + -7 = 0 0 + -7x = -21 + -7 -7x = -21 + -7 Combine like terms: -21 + -7 = -28 -7x = -28 Divide each side by '-7'. x = 4 Simplifying x = 4
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