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3.9q-1.7-3.8q=-0.9q-1.3
We move all terms to the left:
3.9q-1.7-3.8q-(-0.9q-1.3)=0
We add all the numbers together, and all the variables
0.1q-(-0.9q-1.3)-1.7=0
We get rid of parentheses
0.1q+0.9q+1.3-1.7=0
We add all the numbers together, and all the variables
q-0.4=0
We move all terms containing q to the left, all other terms to the right
q=0.4
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