4X+3(X-20)=6X+7(X-9)
问题描述:
4X+3(X-20)=6X+7(X-9)
答
4X+3(X-20)=6X+7(X-9)
4X+3X-60=6X+7X-63
7X-60=13X-63
13X-7X=63-60
6X=3
X=3/6
X=0.5