Solve for f
f=2
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4=2f
Variable f cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by f.
2f=4
Swap sides so that all variable terms are on the left hand side.
f=\frac{4}{2}
Divide both sides by 2.
f=2
Divide 4 by 2 to get 2.
Examples
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Limits
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