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377=8x+4x+x
We move all terms to the left:
377-(8x+4x+x)=0
We add all the numbers together, and all the variables
-(+13x)+377=0
We get rid of parentheses
-13x+377=0
We move all terms containing x to the left, all other terms to the right
-13x=-377
x=-377/-13
x=+29
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