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-2(f+5)+3=-15
We move all terms to the left:
-2(f+5)+3-(-15)=0
We add all the numbers together, and all the variables
-2(f+5)+18=0
We multiply parentheses
-2f-10+18=0
We add all the numbers together, and all the variables
-2f+8=0
We move all terms containing f to the left, all other terms to the right
-2f=-8
f=-8/-2
f=+4
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