-12+f=21

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Solution for -12+f=21 equation: 


Simplifying
-12 + f = 21

Solving
-12 + f = 21

Solving for variable 'f'.

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

Add '12' to each side of the equation.
-12 + 12 + f = 21 + 12

Combine like terms: -12 + 12 = 0
0 + f = 21 + 12
f = 21 + 12

Combine like terms: 21 + 12 = 33
f = 33

Simplifying
f = 33

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