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850=250+12x
We move all terms to the left:
850-(250+12x)=0
We add all the numbers together, and all the variables
-(12x+250)+850=0
We get rid of parentheses
-12x-250+850=0
We add all the numbers together, and all the variables
-12x+600=0
We move all terms containing x to the left, all other terms to the right
-12x=-600
x=-600/-12
x=+50
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