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257=77+10x
We move all terms to the left:
257-(77+10x)=0
We add all the numbers together, and all the variables
-(10x+77)+257=0
We get rid of parentheses
-10x-77+257=0
We add all the numbers together, and all the variables
-10x+180=0
We move all terms containing x to the left, all other terms to the right
-10x=-180
x=-180/-10
x=+18
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