cpt no 4....................

4.
a.
2x + 3x + 35 = 180
5x = 180 - 35
5x = 145
x = 145 / 5
x = 29


b.
2b + 2b + 2b = 180
6b = 180
b = 180 / 6
b = 30

c.
3x + c + c = 180
3x + 2c = 180
2c = 180 - 3x
c = 90 - 3/2x

3x + 2c = 180
3x = 180 - 2c
x = 60 - 2/3c