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-23f-21=-5(5f+5)
We move all terms to the left:
-23f-21-(-5(5f+5))=0
We calculate terms in parentheses: -(-5(5f+5)), so:We get rid of parentheses
-5(5f+5)
We multiply parentheses
-25f-25
Back to the equation:
-(-25f-25)
-23f+25f+25-21=0
We add all the numbers together, and all the variables
2f+4=0
We move all terms containing f to the left, all other terms to the right
2f=-4
f=-4/2
f=-2
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