5x-1/2=8/2两边加1/25x-1/2+1/2=8/2+1/25x=9/2两边除以55x÷5=9/2÷5x=9/10望采纳，谢谢
5x-1/2=8/25x=8/2+1/25x=9/2x=9/(2*5)x=9/10
