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4+f=12-2.f
We move all terms to the left:
4+f-(12-2.f)=0
We add all the numbers together, and all the variables
f-(-2f+12)+4=0
We get rid of parentheses
f+2f-12+4=0
We add all the numbers together, and all the variables
3f-8=0
We move all terms containing f to the left, all other terms to the right
3f=8
f=8/3
f=2+2/3
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