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3(f*10)=87
We move all terms to the left:
3(f*10)-(87)=0
We add all the numbers together, and all the variables
3(+f*10)-87=0
We multiply parentheses
30f-87=0
We move all terms containing f to the left, all other terms to the right
30f=87
f=87/30
f=2+9/10
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