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