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f/4-21=-27
We move all terms to the left:
f/4-21-(-27)=0
We add all the numbers together, and all the variables
f/4+6=0
We multiply all the terms by the denominator
f+6*4=0
We add all the numbers together, and all the variables
f+24=0
We move all terms containing f to the left, all other terms to the right
f=-24
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