f[x]=-[3x]2

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Solution for f[x]=-[3x]2 equation: 


Simplifying
f[x] = -1[3x] * 2

Multiply f * x
fx = -1[3x] * 2

Remove brackets around [3x]
fx = -1 * 3x * 2

Reorder the terms for easier multiplication:
fx = -1 * 3 * 2x

Multiply -1 * 3
fx = -3 * 2x

Multiply -3 * 2
fx = -6x

Solving
fx = -6x

Solving for variable 'f'.

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

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

Simplifying
f = -6

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