Step 1: Ignore the signs, just simplify the fraction.
Step 2: Count the number of negative (minus) signs. If there is one, then the answer is negative, otherwise it is positive.
Step 2 can also be stated thus:
-/- or +/+ = plus
-/+ or +/- = minus
So, -12/4
12/4 = 3 and there is only 1 negative sign so the answer is negative.
Answer: -3.
Hope that explains it.
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The two negatives cancel out so a negative over a negative is positive. So, -4/-5 = 4/5 or 0.8
2
Because 3 and 9 are both divisible by 3, we can simplify this fraction into 1/3.
3 over 4
27/35