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This is very easy questions lets solve it
-2a - 9 = 39?
Add both site 9
-2a - 9 +9= 39+9
Now Simplyfy
-2a - 9 +9= 39+9
-2a= 48
devide both side with same factors
-2a/-2= 48/-2
a= -24
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add 9 to both sides
-2a-9+9=39+9
then simplify
-2a=48
then divide both sides by the factor
-2a/-2 = 48/2
then simplify and you will get a = -24
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