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-10=4(f+9)+-10
We move all terms to the left:
-10-(4(f+9)+-10)=0
We use the square of the difference formula
-(4(f+9)-10)-10=0
We calculate terms in parentheses: -(4(f+9)-10), so:We get rid of parentheses
4(f+9)-10
We multiply parentheses
4f+36-10
We add all the numbers together, and all the variables
4f+26
Back to the equation:
-(4f+26)
-4f-26-10=0
We add all the numbers together, and all the variables
-4f-36=0
We move all terms containing f to the left, all other terms to the right
-4f=36
f=36/-4
f=-9
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