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Simplifying 9(x + 2) = 21 + 3(3x + -1) Reorder the terms: 9(2 + x) = 21 + 3(3x + -1) (2 * 9 + x * 9) = 21 + 3(3x + -1) (18 + 9x) = 21 + 3(3x + -1) Reorder the terms: 18 + 9x = 21 + 3(-1 + 3x) 18 + 9x = 21 + (-1 * 3 + 3x * 3) 18 + 9x = 21 + (-3 + 9x) Combine like terms: 21 + -3 = 18 18 + 9x = 18 + 9x Add '-18' to each side of the equation. 18 + -18 + 9x = 18 + -18 + 9x Combine like terms: 18 + -18 = 0 0 + 9x = 18 + -18 + 9x 9x = 18 + -18 + 9x Combine like terms: 18 + -18 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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