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7.8f-22=1.3f
We move all terms to the left:
7.8f-22-(1.3f)=0
We add all the numbers together, and all the variables
7.8f-(+1.3f)-22=0
We get rid of parentheses
7.8f-1.3f-22=0
We add all the numbers together, and all the variables
6.5f-22=0
We move all terms containing f to the left, all other terms to the right
6.5f=22
f=22/6.5
f=3+1/2.6
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