0.6 times of x is 2.1 less than 5 times of 0.75, find x.
x的0.6倍比0.75的5倍少2.1，求x．
<gadget id="calculator">0.75 * 5</gadget>
<output>3.75</output>

<gadget id="calculator">3.75 - 2.1</gadget>
<output>1.65</output>

<gadget id="calculator">1.65 / 0.6</gadget>
<output>2.75</output>

<result>2.75</result>