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