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Simplifying -7(3x + -1) + 6 = -21x + 13 Reorder the terms: -7(-1 + 3x) + 6 = -21x + 13 (-1 * -7 + 3x * -7) + 6 = -21x + 13 (7 + -21x) + 6 = -21x + 13 Reorder the terms: 7 + 6 + -21x = -21x + 13 Combine like terms: 7 + 6 = 13 13 + -21x = -21x + 13 Reorder the terms: 13 + -21x = 13 + -21x Add '-13' to each side of the equation. 13 + -13 + -21x = 13 + -13 + -21x Combine like terms: 13 + -13 = 0 0 + -21x = 13 + -13 + -21x -21x = 13 + -13 + -21x Combine like terms: 13 + -13 = 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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