f+9=7f-15

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Solution for f+9=7f-15 equation:


Simplifying
f + 9 = 7f + -15

Reorder the terms:
9 + f = 7f + -15

Reorder the terms:
9 + f = -15 + 7f

Solving
9 + f = -15 + 7f

Solving for variable 'f'.

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

Add '-7f' to each side of the equation.
9 + f + -7f = -15 + 7f + -7f

Combine like terms: f + -7f = -6f
9 + -6f = -15 + 7f + -7f

Combine like terms: 7f + -7f = 0
9 + -6f = -15 + 0
9 + -6f = -15

Add '-9' to each side of the equation.
9 + -9 + -6f = -15 + -9

Combine like terms: 9 + -9 = 0
0 + -6f = -15 + -9
-6f = -15 + -9

Combine like terms: -15 + -9 = -24
-6f = -24

Divide each side by '-6'.
f = 4

Simplifying
f = 4

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