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10+3f=-20-7f
We move all terms to the left:
10+3f-(-20-7f)=0
We add all the numbers together, and all the variables
3f-(-7f-20)+10=0
We get rid of parentheses
3f+7f+20+10=0
We add all the numbers together, and all the variables
10f+30=0
We move all terms containing f to the left, all other terms to the right
10f=-30
f=-30/10
f=-3
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