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Simplifying -2a + 7(a + -3) = 5a + -20 Reorder the terms: -2a + 7(-3 + a) = 5a + -20 -2a + (-3 * 7 + a * 7) = 5a + -20 -2a + (-21 + 7a) = 5a + -20 Reorder the terms: -21 + -2a + 7a = 5a + -20 Combine like terms: -2a + 7a = 5a -21 + 5a = 5a + -20 Reorder the terms: -21 + 5a = -20 + 5a Add '-5a' to each side of the equation. -21 + 5a + -5a = -20 + 5a + -5a Combine like terms: 5a + -5a = 0 -21 + 0 = -20 + 5a + -5a -21 = -20 + 5a + -5a Combine like terms: 5a + -5a = 0 -21 = -20 + 0 -21 = -20 Solving -21 = -20 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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