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6(7+x)=84
We move all terms to the left:
6(7+x)-(84)=0
We add all the numbers together, and all the variables
6(x+7)-84=0
We multiply parentheses
6x+42-84=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7
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