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(2*y-1)/5 = (4*y-7)/7 // - (4*y-7)/7
(2*y-1)/5-((4*y-7)/7) = 0
(2*y-1)/5+(-1*(4*y-7))/7 = 0
(7*(2*y-1))/(5*7)+(-1*5*(4*y-7))/(5*7) = 0
7*(2*y-1)-1*5*(4*y-7) = 0
28-6*y = 0
(28-6*y)/(5*7) = 0
(28-6*y)/(5*7) = 0 // * 5*7
28-6*y = 0
28-6*y = 0 // - 28
-6*y = -28 // : -6
y = -28/(-6)
y = 14/3
y = 14/3
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