Solve the equation: 120x-1000=1000-40x.
解方程：120x-1000=1000-40x．
<gadget id="calculator">1_000 + 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">120 + 40</gadget>
<output>160</output>

<gadget id="calculator">2_000 / 160</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>