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3(6+1)=x
We move all terms to the left:
3(6+1)-(x)=0
We add all the numbers together, and all the variables
-x+37=0
We add all the numbers together, and all the variables
-1x+37=0
We move all terms containing x to the left, all other terms to the right
-x=-37
x=-37/-1
x=+37
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