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y in (-oo:+oo)
11 = (7*y-1)/2+(4*y-5)/7 // - (7*y-1)/2+(4*y-5)/7
11-((7*y-1)/2)-((4*y-5)/7) = 0
(-1*(7*y-1))/2+(-1*(4*y-5))/7+11 = 0
(-1*7*(7*y-1))/(2*7)+(-1*2*(4*y-5))/(2*7)+(2*7*11)/(2*7) = 0
2*7*11-1*7*(7*y-1)-1*2*(4*y-5) = 0
17-57*y+154 = 0
171-57*y = 0
(171-57*y)/(2*7) = 0
(171-57*y)/(2*7) = 0 // * 2*7
171-57*y = 0
171-57*y = 0 // - 171
-57*y = -171 // : -57
y = -171/(-57)
y = 3
y = 3
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