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-7(5f+3)=8f-30
We move all terms to the left:
-7(5f+3)-(8f-30)=0
We multiply parentheses
-35f-(8f-30)-21=0
We get rid of parentheses
-35f-8f+30-21=0
We add all the numbers together, and all the variables
-43f+9=0
We move all terms containing f to the left, all other terms to the right
-43f=-9
f=-9/-43
f=9/43
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