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51=x+2x+7x+1
We move all terms to the left:
51-(x+2x+7x+1)=0
We add all the numbers together, and all the variables
-(10x+1)+51=0
We get rid of parentheses
-10x-1+51=0
We add all the numbers together, and all the variables
-10x+50=0
We move all terms containing x to the left, all other terms to the right
-10x=-50
x=-50/-10
x=+5
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