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1.8q-3.9q+1.6=-4.7
We move all terms to the left:
1.8q-3.9q+1.6-(-4.7)=0
We add all the numbers together, and all the variables
-2.1q+6.3=0
We move all terms containing q to the left, all other terms to the right
-2.1q=-6.3
q=-6.3/-2.1
q=3+-8.881784197E-16/2.1
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