g(x)=3x^2+9x

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Solution for g(x)=3x^2+9x equation: 


Simplifying
g(x) = 3x2 + 9x

Multiply g * x
gx = 3x2 + 9x

Reorder the terms:
gx = 9x + 3x2

Solving
gx = 9x + 3x2

Solving for variable 'g'.

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

Divide each side by 'x'.
g = 9 + 3x

Simplifying
g = 9 + 3x

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