2f+20.5=12.9

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Solution for 2f+20.5=12.9 equation: 


Simplifying
2f + 20.5 = 12.9

Reorder the terms:
20.5 + 2f = 12.9

Solving
20.5 + 2f = 12.9

Solving for variable 'f'.

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

Add '-20.5' to each side of the equation.
20.5 + -20.5 + 2f = 12.9 + -20.5

Combine like terms: 20.5 + -20.5 = 0.0
0.0 + 2f = 12.9 + -20.5
2f = 12.9 + -20.5

Combine like terms: 12.9 + -20.5 = -7.6
2f = -7.6

Divide each side by '2'.
f = -3.8

Simplifying
f = -3.8

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