X-1/4x-1/3(x-1/4x)=18
X-1/4x-1/3x+1/12x=18
X-3/12x-4/12x+1/12x=18
X-6/12x=18
X-1/2x=18
1/2x=18
X=36
Удачи)
X-1/4x-1/3(x-1/4x)=18
X-1/4x-1/3x+1/12x=18
X-3/12x-4/12x+1/12x=18
X-6/12x=18
X-1/2x=18
1/2x=18
X=36
Удачи)