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y in (-oo:+oo)
4*((-5/2)*y-3)+y = 12 // - 12
4*((-5/2)*y-3)+y-12 = 0
4*(-5/2*y-3)+y-12 = 0
4*(-5/2*y-3)+y-12 = 0
-9*y-12-12 = 0
-9*y-24 = 0
-9*y-24 = 0
-9*y-24 = 0 // + 24
-9*y = 24 // : -9
y = 24/(-9)
y = -8/3
y = -8/3
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