solve below question 2 x + 1 = - 15	Choose one:
A) - 8
B) - 9
C) 9
D) 8
E) - 7
<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<gadget id="calculator">-16</gadget>
<output>-16</output>

<gadget id="calculator">(-16) / 2</gadget>
<output>-8</output>

<result>A</result>
solve below question 2 x + 1 = - 15
divide(negate(add(15, 1)), 2)
"2 x + 1 = - 15 x = - 8 a"