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7(x+-6)=28
We move all terms to the left:
7(x+-6)-(28)=0
We add all the numbers together, and all the variables
7(x-6)-28=0
We multiply parentheses
7x-42-28=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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