



 
Hi Fabiola. I'll solve a similar problem to yours so you can see how it is solved.
So I write the equation by interpreting the words into mathematical symbols: "9 times a number..." becomes "9x" "...is decreased by 100..." becomes " 100" "...is the same as..." becomes "=" "...4 is increased by the first number" becomes "4 + x". So 9x  100 = 4 + x. Now I solve for x.
Now you do the same with your question. Hope this helps,  


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