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2q+6.81=1.59
We move all terms to the left:
2q+6.81-(1.59)=0
We add all the numbers together, and all the variables
2q+5.22=0
We move all terms containing q to the left, all other terms to the right
2q=-5.22
q=-5.22/2
q=-2+1/1.6393442622951
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