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Simplifying -3(7x + 6) = -21x + 15 Reorder the terms: -3(6 + 7x) = -21x + 15 (6 * -3 + 7x * -3) = -21x + 15 (-18 + -21x) = -21x + 15 Reorder the terms: -18 + -21x = 15 + -21x Add '21x' to each side of the equation. -18 + -21x + 21x = 15 + -21x + 21x Combine like terms: -21x + 21x = 0 -18 + 0 = 15 + -21x + 21x -18 = 15 + -21x + 21x Combine like terms: -21x + 21x = 0 -18 = 15 + 0 -18 = 15 Solving -18 = 15 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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