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Simplifying -3(7x + -7) = -21x + -21 Reorder the terms: -3(-7 + 7x) = -21x + -21 (-7 * -3 + 7x * -3) = -21x + -21 (21 + -21x) = -21x + -21 Reorder the terms: 21 + -21x = -21 + -21x Add '21x' to each side of the equation. 21 + -21x + 21x = -21 + -21x + 21x Combine like terms: -21x + 21x = 0 21 + 0 = -21 + -21x + 21x 21 = -21 + -21x + 21x Combine like terms: -21x + 21x = 0 21 = -21 + 0 21 = -21 Solving 21 = -21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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