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Simplifying 9x + -3(-5 + 3x) = 15 9x + (-5 * -3 + 3x * -3) = 15 9x + (15 + -9x) = 15 Reorder the terms: 15 + 9x + -9x = 15 Combine like terms: 9x + -9x = 0 15 + 0 = 15 15 = 15 Add '-15' to each side of the equation. 15 + -15 = 15 + -15 Combine like terms: 15 + -15 = 0 0 = 15 + -15 Combine like terms: 15 + -15 = 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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