Answer:
-15/4
Explanation:
when you see a plus near a minus there is a multiplication between the two sign
You have to remember that + · - = - so you can rewrite the expression in this way
-12/5-3/5-3/4
The first two terms have the same denominator, so we can do the operation between the numerators and maintain the same denominator,
(-12-3)/5 = -15/5
both -15 and 5 can be divided by 5, we do this operation for simplify the fraction
-15 : 5 = -3
5 : 5 = 1
-3/1
-3/1 - 3/4
the least common multiple between 1 and 4 is 4 that will be the new denominator of the two fractions
For discover the numerator of the new fraction we must divide 4 by the denominator and then multiply the result by the numerator
(4:1) · (-3)= - 12
-12/4 - 3/4
now we can do the operation between the numerators
-12 - 3 = -15
-15/4