Answer:
5.)
15.36+x=32.11
15.36+x-15.36=32.11-15.36
x=32.11-15.36
x=16.75
6.)
-2(a-3b+c)
-2a+6b-2c
7.)
3a+15y-5a=-a+2(3-a)
-2a+15y= -a+6-2a
-2a+15y=-3a+6
-2a+15y+2a=-3a+6+2a
15y=-a+6
15y/15=-a+6/15
y=-a+6/15
I hope this is good enough:
