Questions on Algebra: Inverse operations for addition and multiplication, reciprocals answered by real tutors!

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Question 132257: how do I solve this question: (3.99-X)/3.5=1.35: how do I solve this question: (3.99-X)/3.5=1.35
Answer by sofiyacherni(96) About Me  (Show Source):
You can put this solution on YOUR website!
(3.99-X)/3.5=1.35/1
use the following formula if a/b=c/d then ad=bc
so (3.99-X)=3.5(1.35)
3.99-X=4.725
3.99-4.725=X
X=-0.735