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177=x+2x
We move all terms to the left:
177-(x+2x)=0
We add all the numbers together, and all the variables
-(+3x)+177=0
We get rid of parentheses
-3x+177=0
We move all terms containing x to the left, all other terms to the right
-3x=-177
x=-177/-3
x=+59
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