12（0.4x+0.9)-2(0.03+0.05x)=300(x-5) x=?
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12（0.4x+0.9)-2(0.03+0.05x)=300(x-5)x=?12（0.4x+0.9)-2(0.03+0.05x)=300(x-5)x=?12（0.4x+0.9)-2(0.03+0.05
12（0.4x+0.9)-2(0.03+0.05x)=300(x-5) x=?
12（0.4x+0.9)-2(0.03+0.05x)=300(x-5) x=?
12（0.4x+0.9)-2(0.03+0.05x)=300(x-5) x=?
23
4.8x+10.8-0.06-0.1x=300x-1500
4.7x+10.74=300x-1500
1510.74=295.3x
x=1510.74/295.3