解:方程两边同时乘以6,得:3(x-100)=2(x+100)两边同时去括号,得3x-300)=2x+200移项,得3x-2x=200+300所以x=500
(x-100)/2=(x+100)/33(x-100)=2(x+100) (方程两边同时乘以6)3x-300=2x+2003x-2x=200+300x=500
(x-100)/2=(x+100)/33(x-100)=2(x+100)3x-300=2x+2003x-2x=200+300x=500
x=500