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-6(2x+1)=42
We move all terms to the left:
-6(2x+1)-(42)=0
We multiply parentheses
-12x-6-42=0
We add all the numbers together, and all the variables
-12x-48=0
We move all terms containing x to the left, all other terms to the right
-12x=48
x=48/-12
x=-4
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