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n in (-oo:+oo)
(9/10)*n+1/5 = (7/10)*n-(3/5) // - (7/10)*n-(3/5)
(9/10)*n-((7/10)*n)+1/5+3/5 = 0
(9/10)*n+(-7/10)*n+1/5+3/5 = 0
1/5*n+4/5 = 0 // - 4/5
1/5*n = -4/5 // : 1/5
n = -4/5/1/5
n = -4
n = -4
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