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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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