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(F)=3F(F)+7F-13
We move all terms to the left:
(F)-(3F(F)+7F-13)=0
We add all the numbers together, and all the variables
F-(7F+3FF-13)=0
We get rid of parentheses
F-7F-3FF+13=0
We add all the numbers together, and all the variables
-6F-3FF+13=0
We move all terms containing F to the left, all other terms to the right
-6F-3FF=-13
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