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-3(1+7x)=39
We move all terms to the left:
-3(1+7x)-(39)=0
We add all the numbers together, and all the variables
-3(7x+1)-39=0
We multiply parentheses
-21x-3-39=0
We add all the numbers together, and all the variables
-21x-42=0
We move all terms containing x to the left, all other terms to the right
-21x=42
x=42/-21
x=-2
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