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n in (-oo:+oo)
2*n+9/10 = (-3/5)*n+1/4 // - (-3/5)*n+1/4
2*n-((-3/5)*n)+9/10-(1/4) = 0
2*n+(3/5)*n+9/10-1/4 = 0
13/5*n+13/20 = 0 // - 13/20
13/5*n = -13/20 // : 13/5
n = -13/20/13/5
n = -1/4
n = -1/4
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