x-0.4x+300=2x/3(要过程)

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x-0.4x+300=2x/3(要过程)x-0.4x+300=2x/3(要过程)x-0.4x+300=2x/3(要过程)x-0.4x+300=2x/3两边同时乘以3得3x-1.2x+900=2x2x-

x-0.4x+300=2x/3(要过程)
x-0.4x+300=2x/3(要过程)

x-0.4x+300=2x/3(要过程)
x-0.4x+300=2x/3 两边同时乘以3得
3x-1.2x+900=2x
2x-3x+1.2x=900
0.2x=900
x=900÷0.2
x=4500