-.2f+.8f+21=6

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Solution for -.2f+.8f+21=6 equation:


Simplifying
-0.2f + 0.8f + 21 = 6

Reorder the terms:
21 + -0.2f + 0.8f = 6

Combine like terms: -0.2f + 0.8f = 0.6f
21 + 0.6f = 6

Solving
21 + 0.6f = 6

Solving for variable 'f'.

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

Add '-21' to each side of the equation.
21 + -21 + 0.6f = 6 + -21

Combine like terms: 21 + -21 = 0
0 + 0.6f = 6 + -21
0.6f = 6 + -21

Combine like terms: 6 + -21 = -15
0.6f = -15

Divide each side by '0.6'.
f = -25

Simplifying
f = -25

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