Question

simplify
a+b-(2a+2b)+(4b-a)
by removing parentheses and switching the signs?

Answer 1

so i did
a+b+(-2a-2b)+(4b-a) changed the signs where there was negative in front of parentheses
then a cancels out, so I'm left with -b+4b
end up with 3b
is this right?

Answer 2

a + b - (2a + 2b) + 4b - a
a + b - 2a - 2b + 4b - a
combine like terms :
a - a - 2a = -2a
b - 2b + 4b = 3b
so you are left with : -2a + 3b

Answer 3

ohh right, 2a ok thanks