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642.60=2.85x+36
We move all terms to the left:
642.60-(2.85x+36)=0
We add all the numbers together, and all the variables
-(2.85x+36)+642.6=0
We get rid of parentheses
-2.85x-36+642.6=0
We add all the numbers together, and all the variables
-2.85x+606.6=0
We move all terms containing x to the left, all other terms to the right
-2.85x=-606.6
x=-606.6/-2.85
x=212+1/1.1875
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