3(f-9)=21

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Solution for 3(f-9)=21 equation: 


Simplifying
3(f + -9) = 21

Reorder the terms:
3(-9 + f) = 21
(-9 * 3 + f * 3) = 21
(-27 + 3f) = 21

Solving
-27 + 3f = 21

Solving for variable 'f'.

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

Add '27' to each side of the equation.
-27 + 27 + 3f = 21 + 27

Combine like terms: -27 + 27 = 0
0 + 3f = 21 + 27
3f = 21 + 27

Combine like terms: 21 + 27 = 48
3f = 48

Divide each side by '3'.
f = 16

Simplifying
f = 16

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