3f+9=f+15

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Solution for 3f+9=f+15 equation:


Simplifying
3f + 9 = f + 15

Reorder the terms:
9 + 3f = f + 15

Reorder the terms:
9 + 3f = 15 + f

Solving
9 + 3f = 15 + f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
9 + 3f + -1f = 15 + f + -1f

Combine like terms: 3f + -1f = 2f
9 + 2f = 15 + f + -1f

Combine like terms: f + -1f = 0
9 + 2f = 15 + 0
9 + 2f = 15

Add '-9' to each side of the equation.
9 + -9 + 2f = 15 + -9

Combine like terms: 9 + -9 = 0
0 + 2f = 15 + -9
2f = 15 + -9

Combine like terms: 15 + -9 = 6
2f = 6

Divide each side by '2'.
f = 3

Simplifying
f = 3

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