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-3(3+a)=-51
We move all terms to the left:
-3(3+a)-(-51)=0
We add all the numbers together, and all the variables
-3(a+3)-(-51)=0
We add all the numbers together, and all the variables
-3(a+3)+51=0
We multiply parentheses
-3a-9+51=0
We add all the numbers together, and all the variables
-3a+42=0
We move all terms containing a to the left, all other terms to the right
-3a=-42
a=-42/-3
a=+14
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