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n in (-oo:+oo)
-3/40 = (3/4)*n-4*n+9/10 // - (3/4)*n-4*n+9/10
-(-4*n)-((3/4)*n)-3/40-(9/10) = 0
4*n+(-3/4)*n-3/40-9/10 = 0
13/4*n-39/40 = 0 // + 39/40
13/4*n = 39/40 // : 13/4
n = 39/40/13/4
n = 3/10
n = 3/10
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