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402.96=210+0.67x
We move all terms to the left:
402.96-(210+0.67x)=0
We add all the numbers together, and all the variables
-(0.67x+210)+402.96=0
We get rid of parentheses
-0.67x-210+402.96=0
We add all the numbers together, and all the variables
-0.67x+192.96=0
We move all terms containing x to the left, all other terms to the right
-0.67x=-192.96
x=-192.96/-0.67
x=+288
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