3(f-5)=-21

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Solution for 3(f-5)=-21 equation: 


Simplifying
3(f + -5) = -21

Reorder the terms:
3(-5 + f) = -21
(-5 * 3 + f * 3) = -21
(-15 + 3f) = -21

Solving
-15 + 3f = -21

Solving for variable 'f'.

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

Add '15' to each side of the equation.
-15 + 15 + 3f = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 3f = -21 + 15
3f = -21 + 15

Combine like terms: -21 + 15 = -6
3f = -6

Divide each side by '3'.
f = -2

Simplifying
f = -2

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