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-9-9f=8(-9f-9)
We move all terms to the left:
-9-9f-(8(-9f-9))=0
We calculate terms in parentheses: -(8(-9f-9)), so:We get rid of parentheses
8(-9f-9)
We multiply parentheses
-72f-72
Back to the equation:
-(-72f-72)
-9f+72f+72-9=0
We add all the numbers together, and all the variables
63f+63=0
We move all terms containing f to the left, all other terms to the right
63f=-63
f=-63/63
f=-1
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