3f-30=21

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Solution for 3f-30=21 equation: 


Simplifying
3f + -30 = 21

Reorder the terms:
-30 + 3f = 21

Solving
-30 + 3f = 21

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Add '30' to each side of the equation.
-30 + 30 + 3f = 21 + 30

Combine like terms: -30 + 30 = 0
0 + 3f = 21 + 30
3f = 21 + 30

Combine like terms: 21 + 30 = 51
3f = 51

Divide each side by '3'.
f = 17

Simplifying
f = 17

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