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25=-3f+4f
We move all terms to the left:
25-(-3f+4f)=0
We add all the numbers together, and all the variables
-(+f)+25=0
We get rid of parentheses
-f+25=0
We add all the numbers together, and all the variables
-1f+25=0
We move all terms containing f to the left, all other terms to the right
-f=-25
f=-25/-1
f=+25
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