a)
18a = 180
a = 10
7a = 70
10a = 100
b)
8a + 20 = 180
8a = 160
a = 20
3a = 60
4a + 20 = 100
c)
2a - 60 + 3a - 120 +a = 180
6a = 360
a = 60
120-60 = 60 - 2a - 60
3a - 120= 180- 120= 60
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a)
18a = 180
a = 10
7a = 70
10a = 100
b)
8a + 20 = 180
8a = 160
a = 20
3a = 60
4a + 20 = 100
c)
2a - 60 + 3a - 120 +a = 180
6a = 360
a = 60
120-60 = 60 - 2a - 60
3a - 120= 180- 120= 60