7+f-8=20

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Solution for 7+f-8=20 equation: 


Simplifying
7 + f + -8 = 20

Reorder the terms:
7 + -8 + f = 20

Combine like terms: 7 + -8 = -1
-1 + f = 20

Solving
-1 + f = 20

Solving for variable 'f'.

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

Add '1' to each side of the equation.
-1 + 1 + f = 20 + 1

Combine like terms: -1 + 1 = 0
0 + f = 20 + 1
f = 20 + 1

Combine like terms: 20 + 1 = 21
f = 21

Simplifying
f = 21

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