1/3x+1/4x+2.8=x

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1/3x+1/4x+2.8=x
1/3x+1/4x+2.8=x

1/3x+1/4x+2.8=x
1/3x+1/4x+2.8=x
x-1/3x-1/4x=2.8
x-4/12x-3/12x=2.8
5/12x=14/5
x=14/5x12/5
x=168/25

先移向
x-1/3x-1/4x=2.8
x-4/12x-3/12x=2.8
5/12x=14/5
x=14/5x12/5
x=168/25
希望对你有帮助~

x-1/3x-1/4x=2.8
5/12x=2.8
x=168/25=6.72