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10f+30=15f+50
We move all terms to the left:
10f+30-(15f+50)=0
We get rid of parentheses
10f-15f-50+30=0
We add all the numbers together, and all the variables
-5f-20=0
We move all terms containing f to the left, all other terms to the right
-5f=20
f=20/-5
f=-4
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