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y in (-oo:+oo)
(9/5)*y-12 = (1/4)*y-4 // - (1/4)*y-4
(9/5)*y-((1/4)*y)-12+4 = 0
(9/5)*y+(-1/4)*y-12+4 = 0
31/20*y-8 = 0 // + 8
31/20*y = 8 // : 31/20
y = 8/31/20
y = 160/31
y = 160/31
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