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206=7x+87
We move all terms to the left:
206-(7x+87)=0
We get rid of parentheses
-7x-87+206=0
We add all the numbers together, and all the variables
-7x+119=0
We move all terms containing x to the left, all other terms to the right
-7x=-119
x=-119/-7
x=+17
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