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161=7x+2+7x-9
We move all terms to the left:
161-(7x+2+7x-9)=0
We add all the numbers together, and all the variables
-(14x-7)+161=0
We get rid of parentheses
-14x+7+161=0
We add all the numbers together, and all the variables
-14x+168=0
We move all terms containing x to the left, all other terms to the right
-14x=-168
x=-168/-14
x=+12
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