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Simplifying -21 + -8a = -8(a + 6) Reorder the terms: -21 + -8a = -8(6 + a) -21 + -8a = (6 * -8 + a * -8) -21 + -8a = (-48 + -8a) Add '8a' to each side of the equation. -21 + -8a + 8a = -48 + -8a + 8a Combine like terms: -8a + 8a = 0 -21 + 0 = -48 + -8a + 8a -21 = -48 + -8a + 8a Combine like terms: -8a + 8a = 0 -21 = -48 + 0 -21 = -48 Solving -21 = -48 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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