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