15-f=8

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Solution for 15-f=8 equation: 


Simplifying
15 + -1f = 8

Solving
15 + -1f = 8

Solving for variable 'f'.

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

Add '-15' to each side of the equation.
15 + -15 + -1f = 8 + -15

Combine like terms: 15 + -15 = 0
0 + -1f = 8 + -15
-1f = 8 + -15

Combine like terms: 8 + -15 = -7
-1f = -7

Divide each side by '-1'.
f = 7

Simplifying
f = 7

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