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10-9f=-4-7f
We move all terms to the left:
10-9f-(-4-7f)=0
We add all the numbers together, and all the variables
-9f-(-7f-4)+10=0
We get rid of parentheses
-9f+7f+4+10=0
We add all the numbers together, and all the variables
-2f+14=0
We move all terms containing f to the left, all other terms to the right
-2f=-14
f=-14/-2
f=+7
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