Question 1097237
1/5 (-5a +20b) - 1/2(2b-6a)
distribute the 1/5 over the -5a  to get -a and over 20b to get 4b
The first term is -a+4b
distribute the (-1/2) over 2b to get -b and over -6a to get +3a (two minuses make a plus)
The second term is -b+3a
Adding them would be 3b+2a
The second term has a negative b term, because the (-1/2), and one takes the minus sign with the 1/2
The a is already negative, so the -1/2 will make it positive.