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-2.5+x/6=21.7
We move all terms to the left:
-2.5+x/6-(21.7)=0
We add all the numbers together, and all the variables
x/6-24.2=0
We multiply all the terms by the denominator
x-(24.2)*6=0
We add all the numbers together, and all the variables
x-145.2=0
We move all terms containing x to the left, all other terms to the right
x=145.2
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