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80=84(.5f)/2
We move all terms to the left:
80-(84(.5f)/2)=0
We add all the numbers together, and all the variables
-(84(+.5f)/2)+80=0
We multiply all the terms by the denominator
-(84(+.5f)+80*2)=0
We calculate terms in parentheses: -(84(+.5f)+80*2), so:We get rid of parentheses
84(+.5f)+80*2
We add all the numbers together, and all the variables
84(+.5f)+160
We multiply parentheses
84f+160
Back to the equation:
-(84f+160)
-84f-160=0
We move all terms containing f to the left, all other terms to the right
-84f=160
f=160/-84
f=-1+19/21
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