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|(-3)-4|=|-7|=7
|3-(-4)|=|3+4|=|7|=7
|(-3)-(-4)|=|-3+4|=|1|=1
|2-7|=|-5|=5
|(-2)-7|=|-9|=9
|2-(-7)|=|2+7|=|9|=9
|(-2)-(7)|=|-9|=9