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Simplifying 21a + -18 = -3(1 + -7a) Reorder the terms: -18 + 21a = -3(1 + -7a) -18 + 21a = (1 * -3 + -7a * -3) -18 + 21a = (-3 + 21a) Add '-21a' to each side of the equation. -18 + 21a + -21a = -3 + 21a + -21a Combine like terms: 21a + -21a = 0 -18 + 0 = -3 + 21a + -21a -18 = -3 + 21a + -21a Combine like terms: 21a + -21a = 0 -18 = -3 + 0 -18 = -3 Solving -18 = -3 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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