28+5f-21=

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Solution for 28+5f-21= equation: 


Simplifying
28 + 5f + -21 = 0

Reorder the terms:
28 + -21 + 5f = 0

Combine like terms: 28 + -21 = 7
7 + 5f = 0

Solving
7 + 5f = 0

Solving for variable 'f'.

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

Add '-7' to each side of the equation.
7 + -7 + 5f = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 5f = 0 + -7
5f = 0 + -7

Combine like terms: 0 + -7 = -7
5f = -7

Divide each side by '5'.
f = -1.4

Simplifying
f = -1.4

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