2x+4(50-x)=139-4怎样解过程要详细
问题描述:
2x+4(50-x)=139-4怎样解过程要详细
答
2x+4(50-x)=139-4
2x+200-4x=135
2x-4x=135-200
-2x=-65
x=65/2