if you have a/b=c/d=e/f=g/h=i/j ...
You can take any two and cross multiply
So ad=bc
But you also konw
de=cf
and you can do this with any pair.
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Yes, an expression can have more than one variable.
yes it can I've done a few experiments that have had more than one independant variable.
No.
they have different proportions because one is bigger than the other one
more than one variable