-21=f+18

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Solution for -21=f+18 equation:


Simplifying
-21 = f + 18

Reorder the terms:
-21 = 18 + f

Solving
-21 = 18 + f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
-21 + -1f = 18 + f + -1f

Combine like terms: f + -1f = 0
-21 + -1f = 18 + 0
-21 + -1f = 18

Add '21' to each side of the equation.
-21 + 21 + -1f = 18 + 21

Combine like terms: -21 + 21 = 0
0 + -1f = 18 + 21
-1f = 18 + 21

Combine like terms: 18 + 21 = 39
-1f = 39

Divide each side by '-1'.
f = -39

Simplifying
f = -39

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