Question 200317
Hard  to  see  with  all  the  numbers,,so  Lets  simply  to   a/b =c/d
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now  b* SF = d,,,,and  a* SF = c,,,(SF  is  scale  factor)
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In  the  problem  (3x) * { 12c^8/x } = 36c^8,,,,,,,,,,,,,,,(SF = 12c^8/x)
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Multiplying  Num  by  SF,,,,,,,,,,(-7yt) * { 12c^8/x} = -84 c^8 y t /x  =  ?
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checking  by  cross  multiplying   original
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(-7yt) * ( 36 c^8)  =  (3x) ( -84 c^8 yt/x)
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-252 c^8 yt = -252 c^8 yt ,,,,,ok