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First this you need to do is solve for r
ar+br=35
r(a+b)=35
r=35/(a+b)

The next thing is use substitution so you only have one variable
a+b=140
a=140-b

I didn't think of turning r into terms of ab. Thanks!

Then substitute 140-b in the equation you solved for r
r=35/((140-b)+b)
r=35/140