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165=7x.x
We move all terms to the left:
165-(7x.x)=0
We add all the numbers together, and all the variables
-(+7x.x)+165=0
We get rid of parentheses
-7x.x+165=0
We move all terms containing x to the left, all other terms to the right
-7x.x=-165
x=-165/1
x=-165
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