9=21-cf

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Solution for 9=21-cf equation:


Simplifying
9 = 21 + -1cf

Solving
9 = 21 + -1cf

Solving for variable 'c'.

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

Add 'cf' to each side of the equation.
9 + cf = 21 + -1cf + cf

Combine like terms: -1cf + cf = 0
9 + cf = 21 + 0
9 + cf = 21

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

Combine like terms: 9 + -9 = 0
0 + cf = 21 + -9
cf = 21 + -9

Combine like terms: 21 + -9 = 12
cf = 12

Divide each side by 'f'.
c = 12f-1

Simplifying
c = 12f-1

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