怎么解5.1X-2(X+3)=12.6

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怎么解5.1X-2(X+3)=12.6
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怎么解5.1X-2(X+3)=12.6
怎么解5.1X-2(X+3)=12.6

怎么解5.1X-2(X+3)=12.6
5.1X-2(X+3)=12.6
5.1x-2x-6=12.6
5.1x-2x=12.6+6
3.1x=18.6
x=6

5.1X-2(X+3)=12.6
3.1x=18.6
x=6

5.1X-2(X+3)=12.6,去括号
5.1X-2X-6=12.6,移项
5.1X-2X=12.6+6,合并
3.1X=18.6,系数化1
X=18.6÷3.1
X=6

5.1x-2x-6=12.6
3.1x=18.6
x=6

5.1X-2(X+3)=12.6
5.1X-2X-6=12.6
3.1X=12.6+6
X=6

这也太小儿科了吧
5.1x-2x-6=12.6
3.1x=18.6
x=6