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3f+0.5-1=-7
We move all terms to the left:
3f+0.5-1-(-7)=0
We add all the numbers together, and all the variables
3f+6.5=0
We move all terms containing f to the left, all other terms to the right
3f=-6.5
f=-6.5/3
f=-2+0.5/3
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