42-f=30

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Solution for 42-f=30 equation: 


Simplifying
42 + -1f = 30

Solving
42 + -1f = 30

Solving for variable 'f'.

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

Add '-42' to each side of the equation.
42 + -42 + -1f = 30 + -42

Combine like terms: 42 + -42 = 0
0 + -1f = 30 + -42
-1f = 30 + -42

Combine like terms: 30 + -42 = -12
-1f = -12

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

Simplifying
f = 12

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