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n in (-oo:+oo)
(2/5)*(3*n-25)+7 = 3 // - 3
(2/5)*(3*n-25)-3+7 = 0
2/5*(3*n-25)-3+7 = 0
2/5*(3*n-25)-3+7 = 0
6/5*n-13+7 = 0
6/5*n-6 = 0
6/5*n-6 = 0
6/5*n-6 = 0 // + 6
6/5*n = 6 // : 6/5
n = 6/6/5
n = 5
n = 5
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