-21=10f+9

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Solution for -21=10f+9 equation:


Simplifying
-21 = 10f + 9

Reorder the terms:
-21 = 9 + 10f

Solving
-21 = 9 + 10f

Solving for variable 'f'.

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

Add '-10f' to each side of the equation.
-21 + -10f = 9 + 10f + -10f

Combine like terms: 10f + -10f = 0
-21 + -10f = 9 + 0
-21 + -10f = 9

Add '21' to each side of the equation.
-21 + 21 + -10f = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -10f = 9 + 21
-10f = 9 + 21

Combine like terms: 9 + 21 = 30
-10f = 30

Divide each side by '-10'.
f = -3

Simplifying
f = -3

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