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y in (-oo:+oo)
6-(2*((3-(2*y))/5)) = 4*y // - 4*y
6-(2*((3-(2*y))/5))-(4*y) = 0
(-2/5)*(3-2*y)-4*y+6 = 0
6-2/5*(3-2*y)-4*y = 0
6-2/5*(3-2*y)-4*y = 0
6-16/5*y-6/5 = 0
24/5-16/5*y = 0
24/5-16/5*y = 0
24/5-16/5*y = 0 // - 24/5
-16/5*y = -24/5 // : -16/5
y = -24/5/(-16/5)
y = 3/2
y = 3/2
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