0.6X+15=0.8*(X-15)怎么算
问题描述:
0.6X+15=0.8*(X-15)怎么算
答
0.6X+15=0.8*(X-15)
0.6X+15=0.8X-12
0.6X-0.8X=-12-15
0.2X=27
X=27/0.2
X=135