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Simplifying 9(x + 7) = 3(21 + 3x) Reorder the terms: 9(7 + x) = 3(21 + 3x) (7 * 9 + x * 9) = 3(21 + 3x) (63 + 9x) = 3(21 + 3x) 63 + 9x = (21 * 3 + 3x * 3) 63 + 9x = (63 + 9x) Add '-63' to each side of the equation. 63 + -63 + 9x = 63 + -63 + 9x Combine like terms: 63 + -63 = 0 0 + 9x = 63 + -63 + 9x 9x = 63 + -63 + 9x Combine like terms: 63 + -63 = 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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