2(f-6)=30

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Solution for 2(f-6)=30 equation:



2(f-6)=30
We move all terms to the left:
2(f-6)-(30)=0
We multiply parentheses
2f-12-30=0
We add all the numbers together, and all the variables
2f-42=0
We move all terms containing f to the left, all other terms to the right
2f=42
f=42/2
f=21

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