For a number x, the symbol [x] represents the largest integer not greater than x. For example, [3.14]=3, how many integer roots of the equation [((3x+7)/7)]=4 about x are there.
对于数x，符号【x】表示不大于x的最大整数例如【3.14】=3，则关于x的方程【((3x+7)/7)】=4的整数根有多少个．
<result>2</result>