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-10-8f=-7f+10+f
We move all terms to the left:
-10-8f-(-7f+10+f)=0
We add all the numbers together, and all the variables
-8f-(-6f+10)-10=0
We get rid of parentheses
-8f+6f-10-10=0
We add all the numbers together, and all the variables
-2f-20=0
We move all terms containing f to the left, all other terms to the right
-2f=20
f=20/-2
f=-10
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