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n in (-oo:+oo)
(2/5)*(2-(5*n))+(-7*n)/5 = (18*n)/5+9/5 // - (18*n)/5+9/5
(2/5)*(2-(5*n))+(-7*n)/5-((18*n)/5)-(9/5) = 0
(2/5)*(2-5*n)+(-7*n)/5+(-18/5)*n-9/5 = 0
2/5*(2-5*n)+(-7*n)/5+(-18*n)/5-9/5 = 0
(2/5*5*(2-5*n))/5+(-7*n)/5+(-18*n)/5-9/5 = 0
2/5*5*(2-5*n)-7*n-18*n-9 = 0
4-17*n-18*n-9 = 0
4-35*n-9 = 0
-35*n-5 = 0
(-35*n-5)/5 = 0
(-35*n-5)/5 = 0 // * 5
-35*n-5 = 0
-35*n-5 = 0 // + 5
-35*n = 5 // : -35
n = 5/(-35)
n = -1/7
n = -1/7
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