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Amphitrite1040
I believe it is -45. 

If you want to know how I found the answer, message, and I'll explain how I got my answer 
Kume
Two thirds of a number reduced by 11 is equal to 4 more than the number. Find the number
x-11=x+4
Add 11 to both sides;
x-11+11=x+4+11
Subtract x from bpth sides;
x-x=x+15-x