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378.84=210+0.67x
We move all terms to the left:
378.84-(210+0.67x)=0
We add all the numbers together, and all the variables
-(0.67x+210)+378.84=0
We get rid of parentheses
-0.67x-210+378.84=0
We add all the numbers together, and all the variables
-0.67x+168.84=0
We move all terms containing x to the left, all other terms to the right
-0.67x=-168.84
x=-168.84/-0.67
x=+252
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