Solve the equation: 0.75x+3*0.8=7.5.
解方程：0.75x+3*0.8=7.5．
<gadget id="calculator">3 * 0.8</gadget>
<output>2.4</output>

<gadget id="calculator">7.5 - 2.4</gadget>
<output>5.1</output>

<gadget id="calculator">5.1 / 0.75</gadget>
<output>6.8</output>

<result>6.8</result>