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y in (-oo:+oo)
(1/5)*(3*y-4) = 2/5 // - 2/5
(1/5)*(3*y-4)-(2/5) = 0
(1/5)*(3*y-4)-2/5 = 0
1/5*(3*y-4)-2/5 = 0
(1/5*5*(3*y-4))/5-2/5 = 0
1/5*5*(3*y-4)-2 = 0
3*y-6 = 0
(3*y-6)/5 = 0
(3*y-6)/5 = 0 // * 5
3*y-6 = 0
3*y-6 = 0 // + 6
3*y = 6 // : 3
y = 6/3
y = 2
y = 2
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