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Simplifying -3(2x + -7) = -6x + -21 Reorder the terms: -3(-7 + 2x) = -6x + -21 (-7 * -3 + 2x * -3) = -6x + -21 (21 + -6x) = -6x + -21 Reorder the terms: 21 + -6x = -21 + -6x Add '6x' to each side of the equation. 21 + -6x + 6x = -21 + -6x + 6x Combine like terms: -6x + 6x = 0 21 + 0 = -21 + -6x + 6x 21 = -21 + -6x + 6x Combine like terms: -6x + 6x = 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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