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n in (-oo:+oo)
(-4/5)*n+(3/7)*n+2/3 = 17/45 // - 17/45
(-4/5)*n+(3/7)*n+2/3-(17/45) = 0
(-4/5)*n+(3/7)*n+2/3-17/45 = 0
13/45-13/35*n = 0 // - 13/45
-13/35*n = -13/45 // : -13/35
n = -13/45/(-13/35)
n = 7/9
n = 7/9
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