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-257-x=68+12x
We move all terms to the left:
-257-x-(68+12x)=0
We add all the numbers together, and all the variables
-x-(12x+68)-257=0
We add all the numbers together, and all the variables
-1x-(12x+68)-257=0
We get rid of parentheses
-1x-12x-68-257=0
We add all the numbers together, and all the variables
-13x-325=0
We move all terms containing x to the left, all other terms to the right
-13x=325
x=325/-13
x=-25
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