f-1(x)=3x+15

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Solution for f-1(x)=3x+15 equation: 


Simplifying
f + -1(x) = 3x + 15

Reorder the terms:
f + -1x = 15 + 3x

Solving
f + -1x = 15 + 3x

Solving for variable 'f'.

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

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

Combine like terms: -1x + x = 0
f + 0 = 15 + 3x + x
f = 15 + 3x + x

Combine like terms: 3x + x = 4x
f = 15 + 4x

Simplifying
f = 15 + 4x

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