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-2f+8=-10-3f+9
We move all terms to the left:
-2f+8-(-10-3f+9)=0
We add all the numbers together, and all the variables
-2f-(-3f-1)+8=0
We get rid of parentheses
-2f+3f+1+8=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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