[(14-x)+(20-x)]÷2=4

问题描述:

[(14-x)+(20-x)]÷2=4

[(14-x)+(20-x)]÷2=4 两边同乘以2
14-x+20-x=8
34-2x=8
2x=34-8
2x=26
x=13

14-X+20-x=8
-2x=-26
x=13