3(f-1)=-21

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Solution for 3(f-1)=-21 equation: 


Simplifying
3(f + -1) = -21

Reorder the terms:
3(-1 + f) = -21
(-1 * 3 + f * 3) = -21
(-3 + 3f) = -21

Solving
-3 + 3f = -21

Solving for variable 'f'.

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

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

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

Combine like terms: -21 + 3 = -18
3f = -18

Divide each side by '3'.
f = -6

Simplifying
f = -6

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