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5.50+0.25q=13
We move all terms to the left:
5.50+0.25q-(13)=0
We add all the numbers together, and all the variables
0.25q-7.5=0
We move all terms containing q to the left, all other terms to the right
0.25q=7.5
q=7.5/0.25
q=30
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