X/4+3=X/3-1/2解方程x/4+3=x/3-1/2解：去分母，得3x+36=4x-6合并同类项，得-x=-30系数化为1，得x=30
X/4+3=X/3-1/2解：X/3-X/4=3+1/2 X/12=7/2 X=7/2*12 X=42
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K
3+1/2=(4/12-3/12)*xx/12=7/22x=84x=42
