Solve the equation: 42+2x=30x.
解方程：42+2x=30x．
<gadget id="calculator">30 - 2</gadget>
<output>28</output>

<gadget id="calculator">42 / 28</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>