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Simplifying -3(x + -7) = 2x + -5x + 21 Reorder the terms: -3(-7 + x) = 2x + -5x + 21 (-7 * -3 + x * -3) = 2x + -5x + 21 (21 + -3x) = 2x + -5x + 21 Reorder the terms: 21 + -3x = 21 + 2x + -5x Combine like terms: 2x + -5x = -3x 21 + -3x = 21 + -3x Add '-21' to each side of the equation. 21 + -21 + -3x = 21 + -21 + -3x Combine like terms: 21 + -21 = 0 0 + -3x = 21 + -21 + -3x -3x = 21 + -21 + -3x Combine like terms: 21 + -21 = 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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