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n in (-oo:+oo)
(1/2)*(6*n-12) = (3/4)*(4-n) // - (3/4)*(4-n)
(1/2)*(6*n-12)-((3/4)*(4-n)) = 0
(1/2)*(6*n-12)+(-3/4)*(4-n) = 0
1/2*(6*n-12)-3/4*(4-n) = 0
1/2*(6*n-12)-3/4*(4-n) = 0
15/4*n-9 = 0
15/4*n-9 = 0
15/4*n-9 = 0 // + 9
15/4*n = 9 // : 15/4
n = 9/15/4
n = 12/5
n = 12/5
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