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8-10f=-4+2f-9f
We move all terms to the left:
8-10f-(-4+2f-9f)=0
We add all the numbers together, and all the variables
-10f-(-7f-4)+8=0
We get rid of parentheses
-10f+7f+4+8=0
We add all the numbers together, and all the variables
-3f+12=0
We move all terms containing f to the left, all other terms to the right
-3f=-12
f=-12/-3
f=+4
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