According to 84=84, write out an equation of the form ax=b(x+n) (a, b, n are known numbers, x is an unknown number), and solve the equation.
根据84=84，写出形如ax=b(x+n)(a，b，n为已知数，x为未知数)的方程，并解方程．
<gadget id="calculator">4 * 14</gadget>
<output>56</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">56 / 8</gadget>
<output>7</output>

<result>7</result>