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y in (-oo:+oo)
24/34 = (4*y+12)/85 // - (4*y+12)/85
24/34-((4*y+12)/85) = 0
(-1*(4*y+12))/85+12/17 = 0
(-1*17*(4*y+12))/(17*85)+(12*85)/(17*85) = 0
12*85-1*17*(4*y+12) = 0
816-68*y = 0
(816-68*y)/(17*85) = 0
(816-68*y)/(17*85) = 0 // * 17*85
816-68*y = 0
816-68*y = 0 // - 816
-68*y = -816 // : -68
y = -816/(-68)
y = 12
y = 12
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