Hi Mikey
q=3a+5ac
You need to change the equation's side
5ac+3a=q
Factor out a
a(5c+3)=q
Now we need to divide both sides by 5c+3 so we can find the value for a
a(5c+3)/(5c+3)=q/(5c+3)
a= q/(5c+3)
I hope that's help !
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