((1/6)+(1/9)-(1/12))*4*9.
((1/6)+(1/9)-(1/12))*4*9．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/9) - (1/12)</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">(1/6) + (1/36)</gadget>
<output>7/36 = around 0.194444</output>

<gadget id="calculator">(7/36) * 4 * 9</gadget>
<output>7</output>

<result>7</result>