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