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v in (-oo:+oo)
5380/49 = (20/7)*(5*v+24/7) // - (20/7)*(5*v+24/7)
5380/49-((20/7)*(5*v+24/7)) = 0
(-20/7)*(5*v+24/7)+5380/49 = 0
5380/49-20/7*(5*v+24/7) = 0
(-20/7*49*(5*v+24/7))/49+5380/49 = 0
5380-20/7*49*(5*v+24/7) = 0
4900-700*v = 0
(4900-700*v)/49 = 0
(4900-700*v)/49 = 0 // * 49
4900-700*v = 0
4900-700*v = 0 // - 4900
-700*v = -4900 // : -700
v = -4900/(-700)
v = 7
v = 7
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