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(2f-3)+(4f+6)=8f-7
We move all terms to the left:
(2f-3)+(4f+6)-(8f-7)=0
We get rid of parentheses
2f+4f-8f-3+6+7=0
We add all the numbers together, and all the variables
-2f+10=0
We move all terms containing f to the left, all other terms to the right
-2f=-10
f=-10/-2
f=+5
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