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7170-220.4x=5627.2
We move all terms to the left:
7170-220.4x-(5627.2)=0
We add all the numbers together, and all the variables
-220.4x+1542.8=0
We move all terms containing x to the left, all other terms to the right
-220.4x=-1542.8
x=-1542.8/-220.4
x=+7
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