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Simplifying -7(3x + -1) = -21x + 7 Reorder the terms: -7(-1 + 3x) = -21x + 7 (-1 * -7 + 3x * -7) = -21x + 7 (7 + -21x) = -21x + 7 Reorder the terms: 7 + -21x = 7 + -21x Add '-7' to each side of the equation. 7 + -7 + -21x = 7 + -7 + -21x Combine like terms: 7 + -7 = 0 0 + -21x = 7 + -7 + -21x -21x = 7 + -7 + -21x Combine like terms: 7 + -7 = 0 -21x = 0 + -21x -21x = -21x Add '21x' to each side of the equation. -21x + 21x = -21x + 21x Combine like terms: -21x + 21x = 0 0 = -21x + 21x Combine like terms: -21x + 21x = 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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