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Simplifying -3(2x + -7) = -3x + 21 + -3x Reorder the terms: -3(-7 + 2x) = -3x + 21 + -3x (-7 * -3 + 2x * -3) = -3x + 21 + -3x (21 + -6x) = -3x + 21 + -3x Reorder the terms: 21 + -6x = 21 + -3x + -3x Combine like terms: -3x + -3x = -6x 21 + -6x = 21 + -6x Add '-21' to each side of the equation. 21 + -21 + -6x = 21 + -21 + -6x Combine like terms: 21 + -21 = 0 0 + -6x = 21 + -21 + -6x -6x = 21 + -21 + -6x Combine like terms: 21 + -21 = 0 -6x = 0 + -6x -6x = -6x Add '6x' to each side of the equation. -6x + 6x = -6x + 6x Combine like terms: -6x + 6x = 0 0 = -6x + 6x Combine like terms: -6x + 6x = 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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