f(x)=-9x+6+x(-4x-3)

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Solution for f(x)=-9x+6+x(-4x-3) equation: 


Simplifying
f(x) = -9x + 6 + x(-4x + -3)

Multiply f * x
fx = -9x + 6 + x(-4x + -3)

Reorder the terms:
fx = -9x + 6 + x(-3 + -4x)
fx = -9x + 6 + (-3 * x + -4x * x)
fx = -9x + 6 + (-3x + -4x2)

Reorder the terms:
fx = 6 + -9x + -3x + -4x2

Combine like terms: -9x + -3x = -12x
fx = 6 + -12x + -4x2

Solving
fx = 6 + -12x + -4x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 6x-1 + -12 + -4x

Simplifying
f = 6x-1 + -12 + -4x

Reorder the terms:
f = -12 + 6x-1 + -4x

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