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15+2f+20=-1+5f
We move all terms to the left:
15+2f+20-(-1+5f)=0
We add all the numbers together, and all the variables
2f-(5f-1)+15+20=0
We add all the numbers together, and all the variables
2f-(5f-1)+35=0
We get rid of parentheses
2f-5f+1+35=0
We add all the numbers together, and all the variables
-3f+36=0
We move all terms containing f to the left, all other terms to the right
-3f=-36
f=-36/-3
f=+12
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