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Simplifying -3(7x + -1) + 2 = -21x + 5 Reorder the terms: -3(-1 + 7x) + 2 = -21x + 5 (-1 * -3 + 7x * -3) + 2 = -21x + 5 (3 + -21x) + 2 = -21x + 5 Reorder the terms: 3 + 2 + -21x = -21x + 5 Combine like terms: 3 + 2 = 5 5 + -21x = -21x + 5 Reorder the terms: 5 + -21x = 5 + -21x Add '-5' to each side of the equation. 5 + -5 + -21x = 5 + -5 + -21x Combine like terms: 5 + -5 = 0 0 + -21x = 5 + -5 + -21x -21x = 5 + -5 + -21x Combine like terms: 5 + -5 = 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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