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Simplifying -3(3x + 7) = -9x + -21 Reorder the terms: -3(7 + 3x) = -9x + -21 (7 * -3 + 3x * -3) = -9x + -21 (-21 + -9x) = -9x + -21 Reorder the terms: -21 + -9x = -21 + -9x Add '21' to each side of the equation. -21 + 21 + -9x = -21 + 21 + -9x Combine like terms: -21 + 21 = 0 0 + -9x = -21 + 21 + -9x -9x = -21 + 21 + -9x Combine like terms: -21 + 21 = 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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