x(1-37.5)=0.625
x-37.5x=0.625
-36.5x=0.625
x=0.625/-36.5
x=-5/292x(1-37.5)=0.625x(1-37.5)=0.625x-37.5x=0.625--------------x*1-x*37.5=0.625-36.5x=0.625x=0.625/-36.5x=-5/292x(1-37.5)=0.625好啦，简单点x(1-37.5)=0.625x(-36.5)=0.625-36.5x=0.625x=0.625/-36.5x=-5/292