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y in (-oo:+oo)
35 = (9*y-5)/2+(5*y+7)/7 // - (9*y-5)/2+(5*y+7)/7
35-((9*y-5)/2)-((5*y+7)/7) = 0
(-1*(9*y-5))/2+(-1*(5*y+7))/7+35 = 0
(-1*7*(9*y-5))/(2*7)+(-1*2*(5*y+7))/(2*7)+(2*7*35)/(2*7) = 0
2*7*35-1*7*(9*y-5)-1*2*(5*y+7) = 0
21-73*y+490 = 0
511-73*y = 0
(511-73*y)/(2*7) = 0
(511-73*y)/(2*7) = 0 // * 2*7
511-73*y = 0
511-73*y = 0 // - 511
-73*y = -511 // : -73
y = -511/(-73)
y = 7
y = 7
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