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y in (-oo:+oo)
(7*(2*y-1))/5 = 4*y-5 // - 4*y-5
(7*(2*y-1))/5-(4*y)+5 = 0
(7*(2*y-1))/5-4*y+5 = 0
(7*(2*y-1))/5+(-4*5*y)/5+(5^2)/5 = 0
7*(2*y-1)-4*5*y+25 = 0
25-6*y-7 = 0
18-6*y = 0
(18-6*y)/5 = 0
(18-6*y)/5 = 0 // * 5
18-6*y = 0
18-6*y = 0 // - 18
-6*y = -18 // : -6
y = -18/(-6)
y = 3
y = 3
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