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11.3-7.2f=-3.87
We move all terms to the left:
11.3-7.2f-(-3.87)=0
We add all the numbers together, and all the variables
-7.2f+15.17=0
We move all terms containing f to the left, all other terms to the right
-7.2f=-15.17
f=-15.17/-7.2
f=2+0.77/7.2
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