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6x+7(-3x-1)=83
We move all terms to the left:
6x+7(-3x-1)-(83)=0
We multiply parentheses
6x-21x-7-83=0
We add all the numbers together, and all the variables
-15x-90=0
We move all terms containing x to the left, all other terms to the right
-15x=90
x=90/-15
x=-6
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