3(7-x)=5x-43

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3(7-x)=5x-43
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3(7-x)=5x-43
3(7-x)=5x-43

3(7-x)=5x-43

3(7-x)=5x-43
21-3x=5x-43
21+43=5x+3x
8x=64
x=8

化简得21-3x=5x-43,得8x=64,x=8,谢谢!够快吧!

解由3(7-x)=5x-43
得21-3x=5x-43
即8x=64
解得x=8

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