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7(2x+1)=-105
We move all terms to the left:
7(2x+1)-(-105)=0
We add all the numbers together, and all the variables
7(2x+1)+105=0
We multiply parentheses
14x+7+105=0
We add all the numbers together, and all the variables
14x+112=0
We move all terms containing x to the left, all other terms to the right
14x=-112
x=-112/14
x=-8
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