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0.5f+3.5=-12
We move all terms to the left:
0.5f+3.5-(-12)=0
We add all the numbers together, and all the variables
0.5f+15.5=0
We move all terms containing f to the left, all other terms to the right
0.5f=-15.5
f=-15.5/0.5
f=-31
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