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(5)=+12+7.5F
We move all terms to the left:
(5)-(+12+7.5F)=0
We add all the numbers together, and all the variables
-(7.5F+12)+5=0
We get rid of parentheses
-7.5F-12+5=0
We add all the numbers together, and all the variables
-7.5F-7=0
We move all terms containing F to the left, all other terms to the right
-7.5F=7
F=7/-7.5
F=-1/1.07142857143
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