21=-7f

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Solution for 21=-7f equation:


Simplifying
21 = -7f

Solving
21 = -7f

Solving for variable 'f'.

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

Add '7f' to each side of the equation.
21 + 7f = -7f + 7f

Combine like terms: -7f + 7f = 0
21 + 7f = 0

Add '-21' to each side of the equation.
21 + -21 + 7f = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7f = 0 + -21
7f = 0 + -21

Combine like terms: 0 + -21 = -21
7f = -21

Divide each side by '7'.
f = -3

Simplifying
f = -3

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