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4a-2(3a+5)=20
We move all terms to the left:
4a-2(3a+5)-(20)=0
We multiply parentheses
4a-6a-10-20=0
We add all the numbers together, and all the variables
-2a-30=0
We move all terms containing a to the left, all other terms to the right
-2a=30
a=30/-2
a=-15
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