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-2x-161=7x+100
We move all terms to the left:
-2x-161-(7x+100)=0
We get rid of parentheses
-2x-7x-100-161=0
We add all the numbers together, and all the variables
-9x-261=0
We move all terms containing x to the left, all other terms to the right
-9x=261
x=261/-9
x=-29
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