I need help on my math, its really simple but I just don't get. Its about subtracting integers. The question is (+3) - (-4) = ?

A negative and a negative turn into a positive. So you add them together. Like goes with like. Remember that.

The trick to doing this is remembering KCC. This stands for Keep (first number, which in this case is positive three), Change (the sign, in this case the subtraction sign) and Change again (third term, in this case the negative4). Therefore after doing KCC you'll have (+3)+(+4). This equals positive 7.  Hope I helped