(50-x)/2+(50-x)/2*5+10x=240 求X值及步骤

问题描述:

(50-x)/2+(50-x)/2*5+10x=240 求X值及步骤

(50-x)/2+(50-x)/2*5+10x=240
(50-x)+5(50-x)+10x*2=240*2
50-x+250-5x+20x=480
14x+300=480
14x=480-300
14x=180
x=90/7