4.A:12X-1/4-18x+1/6=x/3
12X-18x-x/3=1/4-1/6
-19/3X=1/12
X=-1/76
B：12X-1/4-18x+1/6=x/3
先去分母 144X-3-216X+2=4X
-76X=1
X=-1/76
答：B方法比较简便.
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