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n in (-oo:+oo)
(-4/7)*n+3/5 = (2/5)*n-61/210 // - (2/5)*n-61/210
(-4/7)*n-((2/5)*n)+3/5-(-61/210) = 0
(-4/7)*n+(-2/5)*n+3/5+61/210 = 0
187/210-34/35*n = 0 // - 187/210
-34/35*n = -187/210 // : -34/35
n = -187/210/(-34/35)
n = 11/12
n = 11/12
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