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-2(a+2a-3)=36
We move all terms to the left:
-2(a+2a-3)-(36)=0
We add all the numbers together, and all the variables
-2(3a-3)-36=0
We multiply parentheses
-6a+6-36=0
We add all the numbers together, and all the variables
-6a-30=0
We move all terms containing a to the left, all other terms to the right
-6a=30
a=30/-6
a=-5
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