七分之一（x-14）=四分之一（x-20）
7分之1X-7分之1×14=4分之1X-4分之1×20
7分之1X-2=4分之1X-5
4分之1X-7分之1X=5+2
28分之3X=7
X=7÷28分之3
X=3分之196
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