3x-(3/4)x=(18/19).
3x-(3/4)x=(18/19)．
<gadget id="calculator">18 / 19</gadget>
<output>18/19 = around 0.947368</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 - (3/4)</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">(18/19) / (9/4)</gadget>
<output>8/19 = around 0.421053</output>

<result>8/19 = around 0.421053</result>