3(f-3)=-21

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


Simplifying
3(f + -3) = -21

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

Solving
-9 + 3f = -21

Solving for variable 'f'.

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

Add '9' to each side of the equation.
-9 + 9 + 3f = -21 + 9

Combine like terms: -9 + 9 = 0
0 + 3f = -21 + 9
3f = -21 + 9

Combine like terms: -21 + 9 = -12
3f = -12

Divide each side by '3'.
f = -4

Simplifying
f = -4

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