f-(12)=30

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Solution for f-(12)=30 equation: 


Simplifying
f + -1(12) = 30

Multiply -1 * 12
f + -12 = 30

Reorder the terms:
-12 + f = 30

Solving
-12 + f = 30

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 = 30 + 12

Combine like terms: -12 + 12 = 0
0 + f = 30 + 12
f = 30 + 12

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

Simplifying
f = 42

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