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(3*x-15)/4 = 2*n // - 2*n
(3*x-15)/4-(2*n) = 0
(3*x-15)/4-2*n = 0
(3*x-15)/4+(-2*4*n)/4 = 0
3*x-2*4*n-15 = 0
3*x-8*n-15 = 0
(3*x-8*n-15)/4 = 0
(3*x-8*n-15)/4 = 0 // * 4
3*x-8*n-15 = 0
3*x-8*n-15 = 0 // + -8*n-15
3*x = -(-8*n-15) // : 3
x = (-(-8*n-15))/3
x = (15-(-8*n))/3
x = (15-(-8*n))/3
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