-5f-4+8=21

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Solution for -5f-4+8=21 equation: 


Simplifying
-5f + -4 + 8 = 21

Reorder the terms:
-4 + 8 + -5f = 21

Combine like terms: -4 + 8 = 4
4 + -5f = 21

Solving
4 + -5f = 21

Solving for variable 'f'.

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

Add '-4' to each side of the equation.
4 + -4 + -5f = 21 + -4

Combine like terms: 4 + -4 = 0
0 + -5f = 21 + -4
-5f = 21 + -4

Combine like terms: 21 + -4 = 17
-5f = 17

Divide each side by '-5'.
f = -3.4

Simplifying
f = -3.4

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