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y in (-oo:+oo)
3*((4-(2*y))/5)-(2*y) = 12 // - 12
3*((4-(2*y))/5)-(2*y)-12 = 0
3*((4-2*y)/5)-2*y-12 = 0
(3*(4-2*y))/5-2*y-12 = 0
(3*(4-2*y))/5+(-2*5*y)/5+(-12*5)/5 = 0
3*(4-2*y)-2*5*y-12*5 = 0
12-16*y-60 = 0
-16*y-48 = 0
(-16*y-48)/5 = 0
(-16*y-48)/5 = 0 // * 5
-16*y-48 = 0
-16*y-48 = 0 // + 48
-16*y = 48 // : -16
y = 48/(-16)
y = -3
y = -3
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