m+(8+n-k)=m+8+n-k
a-(b-c+d)=a-b+c-d
x+(y-z+8)=x+y-z+8
m-(-2+n+k)=m+2-n-k
m+(8+n-k)=m+8+n-k;
a-(b-c+d)=a-b+c+d;
x+(y-z+8)=x+y-z+8;
m-(-2+n+k)=m+2+n+k
m+(8+n-k)=m+8+n-k
a-(b-c+d)=a-b+c-d
x+(y-z+8)=x+y-z+8
m-(-2+n+k)=m+2-n-k
m+(8+n-k)=m+8+n-k;
a-(b-c+d)=a-b+c+d;
x+(y-z+8)=x+y-z+8;
m-(-2+n+k)=m+2+n+k