Verified answer

Ответ:

1)(ах-у+у+бх)/(а+б)=(ax+bx)/(a+b)=x(a+b)/(a+b)=x

2)(n+mx-n+3x)/(m+3)=(mx+3x)/(m+3)=x(m+3)/(m+3)=x

3)(px-3q)/(x-y)-(py-3q)/(x-y)=(px-3q-py+3q)/(x-y)=(px-py)/(x-y)=p(x-y)/(x-y)=p

4)(2cx+b)/(2c-3)-(3x+b)/(2c-3)=(2cx+b-3x-b)/(2c-3)=(2cx-3x)/(2c-3)=x(2c-3)/(2c-3)=x