Let $$a\square b=ab+a+b$$ for any integers $$a$$ and $$b$$.  The solution of the equation $$3\square 5=2\square x$$ is: $x = $~\uline{~~~~~~~~~~}~ 
Overseas Competition->Knowledge Point->Calculation Modules->Operations with New Definition->Finding Unknowns Using the Given Operations
$3\square 5=2\square x \implies 15+3+5=2x+2+x$, hence $x=7$. 