Question 15107
-7-4+22-3=22-7-4-3=22-(7+4+3)=22-14=8

and

3-15-4+18=3+18-15-4=21-(15+4)=21-19=2

Thus, 

{{{(-7-4+22-3)/(3-15-4+18)=8/2=4}}}

OK