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y in (-oo:+oo)
1/7-((1/2)*y) = 1/5 // - 1/5
1/7-((1/2)*y)-(1/5) = 0
(-1/2)*y+1/7-1/5 = 0
-1/2*y-2/35 = 0 // + 2/35
-1/2*y = 2/35 // : -1/2
y = 2/35/(-1/2)
y = -4/35
y = -4/35
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