The number A is x, the number B is 0.2 less than three times the number A, the number B is 5.8, what is the number A? (column equation solution)
甲数是x，乙数是甲数的3倍少0.2，乙数是5.8，甲数是多少？(列方程解答)
<gadget id="calculator">5.8 + 0.2</gadget>
<output>6</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<result>2</result>