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Simplifying 9(a + b) = 9a + 9b (a * 9 + b * 9) = 9a + 9b (9a + 9b) = 9a + 9b Add '-9a' to each side of the equation. 9a + -9a + 9b = 9a + -9a + 9b Combine like terms: 9a + -9a = 0 0 + 9b = 9a + -9a + 9b 9b = 9a + -9a + 9b Combine like terms: 9a + -9a = 0 9b = 0 + 9b 9b = 9b Add '-9b' to each side of the equation. 9b + -9b = 9b + -9b Combine like terms: 9b + -9b = 0 0 = 9b + -9b Combine like terms: 9b + -9b = 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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