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x+381=-7x-3
We move all terms to the left:
x+381-(-7x-3)=0
We get rid of parentheses
x+7x+3+381=0
We add all the numbers together, and all the variables
8x+384=0
We move all terms containing x to the left, all other terms to the right
8x=-384
x=-384/8
x=-48
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