7+f-21=-20

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Solution for 7+f-21=-20 equation: 


Simplifying
7 + f + -21 = -20

Reorder the terms:
7 + -21 + f = -20

Combine like terms: 7 + -21 = -14
-14 + f = -20

Solving
-14 + f = -20

Solving for variable 'f'.

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

Add '14' to each side of the equation.
-14 + 14 + f = -20 + 14

Combine like terms: -14 + 14 = 0
0 + f = -20 + 14
f = -20 + 14

Combine like terms: -20 + 14 = -6
f = -6

Simplifying
f = -6

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