f(2x)=8x-5

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Solution for f(2x)=8x-5 equation: 


Simplifying
f(2x) = 8x + -5

Remove parenthesis around (2x)
f * 2x = 8x + -5

Reorder the terms for easier multiplication:
2f * x = 8x + -5

Multiply f * x
2fx = 8x + -5

Reorder the terms:
2fx = -5 + 8x

Solving
2fx = -5 + 8x

Solving for variable 'f'.

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

Divide each side by '2x'.
f = -2.5x-1 + 4

Simplifying
f = -2.5x-1 + 4

Reorder the terms:
f = 4 + -2.5x-1

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