12x+20(x+03)=31.

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12x+20(x+03)=31.
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12x+20(x+03)=31.
12x+20(x+03)=31.

12x+20(x+03)=31.
03?0.
如果是0.3
则:
12x+20(x+03)=31.6
12X+20X+6=31.6
32X=25.6
X=25.6/32
X=0.8
如果是3
则:
12x+20(x+03)=31.6
12X+20X+60=31.6
32X=-28.4
X=-28.4/32
x=-7.1/8