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-14x-71=139-7x
We move all terms to the left:
-14x-71-(139-7x)=0
We add all the numbers together, and all the variables
-14x-(-7x+139)-71=0
We get rid of parentheses
-14x+7x-139-71=0
We add all the numbers together, and all the variables
-7x-210=0
We move all terms containing x to the left, all other terms to the right
-7x=210
x=210/-7
x=-30
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