1/3+2/7+1/5+2/3=( 52/35 )
1/3+2/7+1/5+2/3=1/3+2/3+(10+7)/35=1+17/35=52/35
1/3+2/7+1/5+2/3 =1/3+2/3+(10+7)/35 =1+17/35 =52/35