Solve the equation: 6x-(1.2-0.3)=4.5.
解方程：6x-(1.2-0.3)=4.5．
<gadget id="calculator">4.5 - 0.3</gadget>
<output>4.2</output>

<gadget id="calculator">1.2 + 4.2</gadget>
<output>5.4</output>

<gadget id="calculator">5.4 / 6</gadget>
<output>0.9</output>

<result>0.9</result>