Subtract the sum of -5 and 2 from a number x, the resulting difference is 6, find the value of x.
一个数x减去-5与2的和，所得的差是6，求x的值．
<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>