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4/5-3*y+8/7 = (-5*y)/3 // - (-5*y)/3
4/5-3*y-((-5*y)/3)+8/7 = 0
(5/3)*y-3*y+4/5+8/7 = 0
68/35-4/3*y = 0 // - 68/35
-4/3*y = -68/35 // : -4/3
y = -68/35/(-4/3)
y = 51/35
y = 51/35
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