Write down the solution of the unknown of the equation: given that 3.6x-0.9x=10.8, then x=how much.
写出方程未知数的解：已知3.6x-0.9x=10.8，则x=多少．
<gadget id="calculator">3.6 - 0.9</gadget>
<output>2.7</output>

<gadget id="calculator">10.8 / 2.7</gadget>
<output>4</output>

<result>4</result>