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67=400+30x
We move all terms to the left:
67-(400+30x)=0
We add all the numbers together, and all the variables
-(30x+400)+67=0
We get rid of parentheses
-30x-400+67=0
We add all the numbers together, and all the variables
-30x-333=0
We move all terms containing x to the left, all other terms to the right
-30x=333
x=333/-30
x=-11+1/10
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