3f+6=-15

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Solution for 3f+6=-15 equation: 


Simplifying
3f + 6 = -15

Reorder the terms:
6 + 3f = -15

Solving
6 + 3f = -15

Solving for variable 'f'.

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

Add '-6' to each side of the equation.
6 + -6 + 3f = -15 + -6

Combine like terms: 6 + -6 = 0
0 + 3f = -15 + -6
3f = -15 + -6

Combine like terms: -15 + -6 = -21
3f = -21

Divide each side by '3'.
f = -7

Simplifying
f = -7

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