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f(.5)=-(.5)-7
We move all terms to the left:
f(.5)-(-(.5)-7)=0
We add all the numbers together, and all the variables
f(0.5)-(-(0.5)-7)=0
We add all the numbers together, and all the variables
f(0.5)+7.5=0
We multiply parentheses
0.5f+7.5=0
We move all terms containing f to the left, all other terms to the right
0.5f=-7.5
f=-7.5/0.5
f=-15
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