20/9x+16=x/0.2520/9x+16=x/(1/4)20/9x+16=4x16=4x-20/9x两边同时乘以9得,16*9=4*9X-20X16*9=36X-20X16*9=16XX=9
九分之二十x加16=x除以0.2520x/9+16=x/0.2520x/9+16=4x16x/9=16 x/9=1 x=9