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28x+39=-7x+319
We move all terms to the left:
28x+39-(-7x+319)=0
We get rid of parentheses
28x+7x-319+39=0
We add all the numbers together, and all the variables
35x-280=0
We move all terms containing x to the left, all other terms to the right
35x=280
x=280/35
x=8
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