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7(2+x)-1=-57
We move all terms to the left:
7(2+x)-1-(-57)=0
We add all the numbers together, and all the variables
7(x+2)-1-(-57)=0
We add all the numbers together, and all the variables
7(x+2)+56=0
We multiply parentheses
7x+14+56=0
We add all the numbers together, and all the variables
7x+70=0
We move all terms containing x to the left, all other terms to the right
7x=-70
x=-70/7
x=-10
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