代数式2x-5/x+3与3-4x/5+2x的值互为相反数
(2x-5)/(x+3)+(3-4x)/(5+2x)=0
(2x-5)(2x+5)+(3-4x)(x+3)=0
4x²-25+3x+9-4x²-12x=0
3x-12x=25-9
-9x=16
x=-16/9