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4f+2-8f=-5f-7
We move all terms to the left:
4f+2-8f-(-5f-7)=0
We add all the numbers together, and all the variables
-4f-(-5f-7)+2=0
We get rid of parentheses
-4f+5f+7+2=0
We add all the numbers together, and all the variables
f+9=0
We move all terms containing f to the left, all other terms to the right
f=-9
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