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Simplifying 4a + -2(a + 9) = 4a + -2a + 18 Reorder the terms: 4a + -2(9 + a) = 4a + -2a + 18 4a + (9 * -2 + a * -2) = 4a + -2a + 18 4a + (-18 + -2a) = 4a + -2a + 18 Reorder the terms: -18 + 4a + -2a = 4a + -2a + 18 Combine like terms: 4a + -2a = 2a -18 + 2a = 4a + -2a + 18 Reorder the terms: -18 + 2a = 18 + 4a + -2a Combine like terms: 4a + -2a = 2a -18 + 2a = 18 + 2a Add '-2a' to each side of the equation. -18 + 2a + -2a = 18 + 2a + -2a Combine like terms: 2a + -2a = 0 -18 + 0 = 18 + 2a + -2a -18 = 18 + 2a + -2a Combine like terms: 2a + -2a = 0 -18 = 18 + 0 -18 = 18 Solving -18 = 18 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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