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12f+10=40-3f
We move all terms to the left:
12f+10-(40-3f)=0
We add all the numbers together, and all the variables
12f-(-3f+40)+10=0
We get rid of parentheses
12f+3f-40+10=0
We add all the numbers together, and all the variables
15f-30=0
We move all terms containing f to the left, all other terms to the right
15f=30
f=30/15
f=2
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