3(X一7)十5(X一4)=15怎么解,

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3(X一7)十5(X一4)=15怎么解,3(X一7)十5(X一4)=15怎么解,3(X一7)十5(X一4)=15怎么解,3(X一7)十5(X一4)=153x-21+5x-20=158x-41=158x

3(X一7)十5(X一4)=15怎么解,
3(X一7)十5(X一4)=15怎么解,

3(X一7)十5(X一4)=15怎么解,
3(X一7)十5(X一4)=15
3x-21+5x-20=15
8x-41=15
8x=56
x=7

3X-7+5X-4=15

3x–21+5x–20=15
8x–41=15
8x=56
x=7

3x-21+5x-20=15
8x-41=15
8x-41+41=15+41
8x=56
x=7

8X-21-20=15
,化解得8X等于56,所以X等于7