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Simplifying 6(a + 3) = 21 + -3(1 + -2a) Reorder the terms: 6(3 + a) = 21 + -3(1 + -2a) (3 * 6 + a * 6) = 21 + -3(1 + -2a) (18 + 6a) = 21 + -3(1 + -2a) 18 + 6a = 21 + (1 * -3 + -2a * -3) 18 + 6a = 21 + (-3 + 6a) Combine like terms: 21 + -3 = 18 18 + 6a = 18 + 6a Add '-18' to each side of the equation. 18 + -18 + 6a = 18 + -18 + 6a Combine like terms: 18 + -18 = 0 0 + 6a = 18 + -18 + 6a 6a = 18 + -18 + 6a Combine like terms: 18 + -18 = 0 6a = 0 + 6a 6a = 6a Add '-6a' to each side of the equation. 6a + -6a = 6a + -6a Combine like terms: 6a + -6a = 0 0 = 6a + -6a Combine like terms: 6a + -6a = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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