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319-4x=20x+7
We move all terms to the left:
319-4x-(20x+7)=0
We get rid of parentheses
-4x-20x-7+319=0
We add all the numbers together, and all the variables
-24x+312=0
We move all terms containing x to the left, all other terms to the right
-24x=-312
x=-312/-24
x=+13
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