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16/28=4/7
65/260=1/4
16х/20у=4х/5у
pt/pq=t/q
160ac/24a=20c/3

n(2a-b)/m(2a-b)=n/m
35n(a+b)/63nm(a+b)=5/9nm
xy(c-d)/xy(c-d)=y(c-d)/x(c-d)

(4a-8b)/16a=4*(a-2b)/16a=(a-2b)/4a
(22a-33b)/(11n+44m)=11*(2a-3b)/11*(n+4m)=(2a-3b)/(n+4m)
(ac-bc)/(c+cd)=c*(a-b)/c*(c+d)=(a-b)/(c+d)