阅读理解
Tom was a fat boy when he was ten. He liked watching TV very much. He watched TV at least 5 hours every day. Wherever(无论哪里) he went, he would be late.
One day, he found a pair of special glasses in his post-box(邮箱). He also found a message saying, “With these you can see time.”
The boy decided to have a try. He put the glasses on, looked at his brother, a tall and thin boy, and saw a big box of flowers on top of his head. And it wasn't just his brother. When he looked at his parents, he also saw the flowers. The three boxes were very large and the flowers were very beautiful. Then, he looked at himself from the mirror. He saw the flowers, too. But his flowers went to the mouth of the television. Its mouth was big. His flowers became fewer and fewer.
At last, he learned that watching TV was a waste of time. He could learn nothing from it. He decided he would never again let the television eat his time.
+1=x，□处在印刷时被油墨盖住了，查后面的答案知这个方程的解是x=﹣2，那么□处应该是数字（ ）