Define a*b=a(ab+7), then what is the solution of 3*x=2*(-8).
定义a*b=a(ab+7)，则3*x=2*(-8)的解是多少．
<gadget id="calculator">13 / 3</gadget>
<output>13/3 = around 4.333333</output>

<result>13/3 = around 4.333333</result>