0
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Subtracting a negative is like adding a positive because it is a double negative; therefore subtracting -4 is like adding +4 to -4. Your answer is 0. (-4+4)
Because you cannot subtract 3/4 from 1/4.
you just subtract normally and keep the same sign 4-2=2 (-4)-(-2)=(-2)
-7
-11
15