Question

2(0.3+4)-5(0.2x-7)=9

Answer 1

是求x的值不?

2（0.3+4)-5（0.2x-7)=9

2x0.3+2x4-5x0.2x+5x7=9(乘法分配律,括号前是负号要变号,这步也可省略不写）

0.6+8-x+35=9

-x=9-0.6+8-35

-x=-18.6

x =18.6