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3(2a+)=-30
We move all terms to the left:
3(2a+)-(-30)=0
We add all the numbers together, and all the variables
3(+2a)-(-30)=0
We add all the numbers together, and all the variables
3(+2a)+30=0
We multiply parentheses
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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