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Simplifying -3(7x + -5) = -21x + 15 Reorder the terms: -3(-5 + 7x) = -21x + 15 (-5 * -3 + 7x * -3) = -21x + 15 (15 + -21x) = -21x + 15 Reorder the terms: 15 + -21x = 15 + -21x Add '-15' to each side of the equation. 15 + -15 + -21x = 15 + -15 + -21x Combine like terms: 15 + -15 = 0 0 + -21x = 15 + -15 + -21x -21x = 15 + -15 + -21x Combine like terms: 15 + -15 = 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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