It is known that cb=2ba-b=c, and c is not equal to 0, then what is ((b)/(a))=.
已知c-b=2ba-b=c，且c不等于0，那((b)/(a))=多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>