p(x)=x(72-3x)-(123+12x)

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Solution for p(x)=x(72-3x)-(123+12x) equation: 


Simplifying
p(x) = x(72 + -3x) + -1(123 + 12x)

Multiply p * x
px = x(72 + -3x) + -1(123 + 12x)
px = (72 * x + -3x * x) + -1(123 + 12x)
px = (72x + -3x2) + -1(123 + 12x)
px = 72x + -3x2 + (123 * -1 + 12x * -1)
px = 72x + -3x2 + (-123 + -12x)

Reorder the terms:
px = -123 + 72x + -12x + -3x2

Combine like terms: 72x + -12x = 60x
px = -123 + 60x + -3x2

Solving
px = -123 + 60x + -3x2

Solving for variable 'p'.

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

Divide each side by 'x'.
p = -123x-1 + 60 + -3x

Simplifying
p = -123x-1 + 60 + -3x

Reorder the terms:
p = 60 + -123x-1 + -3x

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