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Simplifying 2(a + 9) = 2(a + -7) Reorder the terms: 2(9 + a) = 2(a + -7) (9 * 2 + a * 2) = 2(a + -7) (18 + 2a) = 2(a + -7) Reorder the terms: 18 + 2a = 2(-7 + a) 18 + 2a = (-7 * 2 + a * 2) 18 + 2a = (-14 + 2a) Add '-2a' to each side of the equation. 18 + 2a + -2a = -14 + 2a + -2a Combine like terms: 2a + -2a = 0 18 + 0 = -14 + 2a + -2a 18 = -14 + 2a + -2a Combine like terms: 2a + -2a = 0 18 = -14 + 0 18 = -14 Solving 18 = -14 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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