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7(8+x)=77
We move all terms to the left:
7(8+x)-(77)=0
We add all the numbers together, and all the variables
7(x+8)-77=0
We multiply parentheses
7x+56-77=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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