f(a)=3x^2+2x+7

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Solution for f(a)=3x^2+2x+7 equation: 


Simplifying
f(a) = 3x2 + 2x + 7

Multiply f * a
af = 3x2 + 2x + 7

Reorder the terms:
af = 7 + 2x + 3x2

Solving
af = 7 + 2x + 3x2

Solving for variable 'a'.

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

Divide each side by 'f'.
a = 7f-1 + 2f-1x + 3f-1x2

Simplifying
a = 7f-1 + 2f-1x + 3f-1x2

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