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Simplifying 3(1 + -7n) = 7(-3 + -3n) (1 * 3 + -7n * 3) = 7(-3 + -3n) (3 + -21n) = 7(-3 + -3n) 3 + -21n = (-3 * 7 + -3n * 7) 3 + -21n = (-21 + -21n) Add '21n' to each side of the equation. 3 + -21n + 21n = -21 + -21n + 21n Combine like terms: -21n + 21n = 0 3 + 0 = -21 + -21n + 21n 3 = -21 + -21n + 21n Combine like terms: -21n + 21n = 0 3 = -21 + 0 3 = -21 Solving 3 = -21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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