Qingfeng stationery store shipped 1000 more brushes than fountain pens, and (3/7) of brushes was the same as (1/2) of fountain pens. How many pens did Qingfeng stationery store ship in total? (equation solution)
庆丰文具店运来的毛笔比钢笔多1000枝，其中毛笔的(3/7)与钢笔的(1/2)枝数相同，问庆丰文具店共运来多少枝笔？(方程解)
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) * 1_000</gadget>
<output>3_000/7 = around 428.571429</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - (3/7)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(3_000/7) / (1/14)</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 + 1_000 + 6_000</gadget>
<output>13_000</output>

<result>13_000</result>