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(25)=4-3F
We move all terms to the left:
(25)-(4-3F)=0
We add all the numbers together, and all the variables
-(-3F+4)+25=0
We get rid of parentheses
3F-4+25=0
We add all the numbers together, and all the variables
3F+21=0
We move all terms containing F to the left, all other terms to the right
3F=-21
F=-21/3
F=-7
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