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7x=-7x+4
We move all terms to the left:
7x-(-7x+4)=0
We get rid of parentheses
7x+7x-4=0
We add all the numbers together, and all the variables
14x-4=0
We move all terms containing x to the left, all other terms to the right
14x=4
x=4/14
x=2/7
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