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Simplifying -2(2x + -7) + 7 = -4x + 21 Reorder the terms: -2(-7 + 2x) + 7 = -4x + 21 (-7 * -2 + 2x * -2) + 7 = -4x + 21 (14 + -4x) + 7 = -4x + 21 Reorder the terms: 14 + 7 + -4x = -4x + 21 Combine like terms: 14 + 7 = 21 21 + -4x = -4x + 21 Reorder the terms: 21 + -4x = 21 + -4x Add '-21' to each side of the equation. 21 + -21 + -4x = 21 + -21 + -4x Combine like terms: 21 + -21 = 0 0 + -4x = 21 + -21 + -4x -4x = 21 + -21 + -4x Combine like terms: 21 + -21 = 0 -4x = 0 + -4x -4x = -4x Add '4x' to each side of the equation. -4x + 4x = -4x + 4x Combine like terms: -4x + 4x = 0 0 = -4x + 4x Combine like terms: -4x + 4x = 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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