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