0.5X+2/0.03-X=0.3
0.005x+2/3-0.01x=0.003
0.015x+2-0.03x=0.009
-0.015x=-1.991
x=132.73
方程0.5X+2/0.03-X=0.3（0.5x+2)/0.2-131/12的过程和解
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