please help with my algebra?

1)
2x + 3a + y - 2 - x - 2a + 2
= 3a - 2a + 2x - x + y - 2 + 2
= a + x + y

2)
y - 3y + 2
= -2y + 2
= -2(y - 2)

3)
20a - y + a + y
= 20a + a - y + y
= 21a

4)
y - x + 1 - 2y + x
= x - x + y - 2y + 1
= -y + 1

5)
5a + 15b + c - 2a - b
= 5a - 2a + 15b - b + c
= 3a + 14b + c

2x+3a+y-2-x-2a+2=2x+3a+y-x-2a
=2x+a+y-x
=x+a+y
y-3y+2= -2y+2
20a-y+a+y=20a+a
=21a
y-x+1-2y+x=y+1-2y
=1-y
5a+15b+c-2a-b=3a+15b+c-b
=3a+14b+c

x+a+y
-2y+2
21a
-y+1
3a+14b+c

Just collect similar terms and do the arithmetic.............

2x+3a+y-2-x-2a+2 = x + a +y

y-3y+2 = 2 - 2y

20a-y+a+y = 21a

y-x+1-2y+x = 1 - y

5a+15b+c-2a-b = 3a + 14b + c

x+a
-2y+2
21a
-y+1
3a+14b+c