SOLUTION: how do I solve this question: (3.99-X)/3.5=1.35

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Question 132257: how do I solve this question: (3.99-X)/3.5=1.35
Answer by sofiyacherni(99) About Me  (Show Source):
You can put this solution on YOUR website!
%283.99-X%29%2F3.5=1.35%2F1
use the following formula if a%2Fb=c%2Fd then ad=bc
so %283.99-X%29=3.5%281.35%29
3.99-X=4.725
3.99-4.725=X
X=-0.735