It is known that 4.5a+15b=31.5, 2.4a-1.25=3.55, then how much is 1.4b-1.36=.
已知4.5a+15b=31.5，2.4a-1.25=3.55，那么1.4b-1.36=多少．
<gadget id="calculator">1.4 * 1.5</gadget>
<output>2.1</output>

<gadget id="calculator">2.1 - 1.36</gadget>
<output>0.74</output>

<result>0.74</result>