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y in (-oo:+oo)
12/5 = (7/4)*y-(8/5) // - (7/4)*y-(8/5)
12/5-((7/4)*y)+8/5 = 0
(-7/4)*y+12/5+8/5 = 0
4-7/4*y = 0 // - 4
-7/4*y = -4 // : -7/4
y = -4/(-7/4)
y = 16/7
y = 16/7
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