(98+86+78+89+94+x)/6+7.5=x 怎么解,求过程

问题描述:

(98+86+78+89+94+x)/6+7.5=x 怎么解,求过程

(98+86+78+89+94+x)/6+7.5=x
(98+86+78+89+94+x)=(x-7.5)*6=6x-45
98+86+78+89+94=5x-45
5x=98+86+78+89+94+45=490
x=98