21-28=-7f

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Solution for 21-28=-7f equation:


Simplifying
21 + -28 = -7f

Combine like terms: 21 + -28 = -7
-7 = -7f

Solving
-7 = -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.
-7 + 7f = -7f + 7f

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

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

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

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

Divide each side by '7'.
f = 1

Simplifying
f = 1

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