f(-3)=2x-15

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Solution for f(-3)=2x-15 equation: 


Simplifying
f(-3) = 2x + -15

Reorder the terms for easier multiplication:
-3f = 2x + -15

Reorder the terms:
-3f = -15 + 2x

Solving
-3f = -15 + 2x

Solving for variable 'f'.

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

Divide each side by '-3'.
f = 5 + -0.6666666667x

Simplifying
f = 5 + -0.6666666667x

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