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f(7-9)=2(7-9)-6
We move all terms to the left:
f(7-9)-(2(7-9)-6)=0
We add all the numbers together, and all the variables
f(-2)-(2(-2)-6)=0
We add all the numbers together, and all the variables
f(-2)+10=0
We multiply parentheses
-2f+10=0
We move all terms containing f to the left, all other terms to the right
-2f=-10
f=-10/-2
f=+5
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