There are three kinds of brines with different salt contents: A, B, and C. The salt content of type A is 4%, that of type B is 6%, and that of type C is 5%. Mix them together to obtain the salt content of 5.3% brine is 10 kg, of which B brine is 2 kg more than C brine, how many kilograms of A brine is there?
有甲、乙、丙三种盐含量不同的盐水，甲种盐水盐含量为4%，乙种盐水盐含量为6%，丙种盐水盐含量为5%，把它们混合在一起，得到盐含量为5.3%的盐水10千克，其中乙种盐水比丙种盐水多2千克，求甲种盐水有多少千克？
<gadget id="calculator">8 * 0.04</gadget>
<output>0.32</output>

<gadget id="calculator">0.53 - 0.32 - 0.12</gadget>
<output>0.09</output>

<gadget id="calculator">2 * 0.04</gadget>
<output>0.08</output>

<gadget id="calculator">0.05 - 0.08</gadget>
<output>-0.03</output>

<gadget id="calculator">0.06 + (-0.03)</gadget>
<output>0.03</output>

<gadget id="calculator">0.09 / 0.03</gadget>
<output>3</output>

<gadget id="calculator">10 - 3 - 3 - 2</gadget>
<output>2</output>

<result>2</result>