-6 -9a = 16 : Add 6 to both sides
-9a = 22 : Multiply both sides by -1
9a = -16 : Divide both sides by 9
a = -16/9 = -17/9
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-21 = 9a - 15 - 3a -6 = 6a -1 = a
It is: 9a-a-a = 7a
a = 6b = 9a + b = 6 + 9 = 15
If: 9a = 18b Then: a = 2b
a= -0.8