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279.65=170+0.51x
We move all terms to the left:
279.65-(170+0.51x)=0
We add all the numbers together, and all the variables
-(0.51x+170)+279.65=0
We get rid of parentheses
-0.51x-170+279.65=0
We add all the numbers together, and all the variables
-0.51x+109.65=0
We move all terms containing x to the left, all other terms to the right
-0.51x=-109.65
x=-109.65/-0.51
x=+215
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