litanalove 1) (ax-y+y+bx)/(a+b)=(ax+bx)/(a+b)=x(a+b)/a+b=x
2) (n+mx-n+3x)/(m+3)=x(m+3)/m+3)=x
3) (px-3q-py+3q)/(x-y)=p(x-y)/(x-y)=p
4) (2cx+b-3x-b)/(2c-3)=x(2c-3)/(2c-3)=x