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y in (-oo:+oo)
-8/7 = (1/2)*y-(1/3) // - (1/2)*y-(1/3)
1/3-((1/2)*y)-8/7 = 0
(-1/2)*y-8/7+1/3 = 0
-1/2*y-17/21 = 0 // + 17/21
-1/2*y = 17/21 // : -1/2
y = 17/21/(-1/2)
y = -34/21
y = -34/21
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