2.1X+7.9X=6.9
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2.1X+7.9X=6.92.1X+7.9X=6.92.1X+7.9X=6.92.1X+7.9X=6.9（2.1+7.9）x=6.910x=6.9x=0.6910x=6.9x=6.9/10x=0.69
2.1X+7.9X=6.9
2.1X+7.9X=6.9
2.1X+7.9X=6.9
2.1X+7.9X=6.9
（2.1+7.9）x=6.9
10x=6.9
x=0.69
10x=6.9
x=6.9/10
x=0.69
2.1X+7.9X=6.9
7.9 x+1.58+x=6.9x-8.42解方程
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2.1X+7.9X=6.9解方程.5X+0.8乘2=7.3解方程
7.9+1.58+x=6.9x-8.42方程解
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