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Simplifying 9n + 3(n + -4) = 12(n + 7) Reorder the terms: 9n + 3(-4 + n) = 12(n + 7) 9n + (-4 * 3 + n * 3) = 12(n + 7) 9n + (-12 + 3n) = 12(n + 7) Reorder the terms: -12 + 9n + 3n = 12(n + 7) Combine like terms: 9n + 3n = 12n -12 + 12n = 12(n + 7) Reorder the terms: -12 + 12n = 12(7 + n) -12 + 12n = (7 * 12 + n * 12) -12 + 12n = (84 + 12n) Add '-12n' to each side of the equation. -12 + 12n + -12n = 84 + 12n + -12n Combine like terms: 12n + -12n = 0 -12 + 0 = 84 + 12n + -12n -12 = 84 + 12n + -12n Combine like terms: 12n + -12n = 0 -12 = 84 + 0 -12 = 84 Solving -12 = 84 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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