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x+(7+7x)=55
We move all terms to the left:
x+(7+7x)-(55)=0
We add all the numbers together, and all the variables
x+(7x+7)-55=0
We get rid of parentheses
x+7x+7-55=0
We add all the numbers together, and all the variables
8x-48=0
We move all terms containing x to the left, all other terms to the right
8x=48
x=48/8
x=6
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