3(f+7)=-42

Solution for 3(f+7)=-42 equation:

Simplifying
3(f + 7) = -42

Reorder the terms:
3(7 + f) = -42
(7 * 3 + f * 3) = -42
(21 + 3f) = -42

Solving
21 + 3f = -42

Solving for variable 'f'.

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

Add '-21' to each side of the equation.
21 + -21 + 3f = -42 + -21

Combine like terms: 21 + -21 = 0
0 + 3f = -42 + -21
3f = -42 + -21

Combine like terms: -42 + -21 = -63
3f = -63

Divide each side by '3'.
f = -21

Simplifying
f = -21