5/1X+4/1X+3/1X+3900=X

问题描述:

5/1X+4/1X+3/1X+3900=X
我要中间的过程怎么解方程都忘了

5/1X+4/1X+3/1X+3900=X
60/12X+60/15X+60/20X+3900=X
60/47X+3900=X
X-60/47X=3900
60/13X=3900
X=3900÷60/13
X=18000
/("/"的意识是几分之几)