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3a-a = (-20) +10
2a = (-10)
a = (-10) : 2 = -5
2. 2a -5 = 4a + 15
2a-4a = 15+5
-2a =20
a = 20:(-2) = -10
3. 3a + 15= a-45
3a-a = -45 -15
2a = -60
a = (-60) :2 = -30
4. a+ 20 = 5a + 55
a-5a = 55-20
-4a = 35
a = 35:(-4) = -8.75