This is dividing Rational Numbers....

Question

I forgot how to do this...

22x + 10 / 2

45 - 5x / 5

-15 + 21a / -3

I forgot how to do this seriously..

Answer 1

you divide each term, for instance on the last...

(-15+21a)/-3=

-15/-3 + 21a/-3

5 -7a

Answer 2

But how do you get the (-) minus sign from the (+) addition sign...????