85×0.4+0.4+X=17434+0.4+X=174X=174-34-0.4X=139.6若方程式为85×0.4+0.4*X=17434+0.4*X=1740.4*X=140X=140/0.4X=350如果回答可以帮到你,请帮忙点击采纳,谢谢