n=(3x-21)(x+1)

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Solution for n=(3x-21)(x+1) equation: 


Simplifying
n = (3x + -21)(x + 1)

Reorder the terms:
n = (-21 + 3x)(x + 1)

Reorder the terms:
n = (-21 + 3x)(1 + x)

Multiply (-21 + 3x) * (1 + x)
n = (-21(1 + x) + 3x * (1 + x))
n = ((1 * -21 + x * -21) + 3x * (1 + x))
n = ((-21 + -21x) + 3x * (1 + x))
n = (-21 + -21x + (1 * 3x + x * 3x))
n = (-21 + -21x + (3x + 3x2))

Combine like terms: -21x + 3x = -18x
n = (-21 + -18x + 3x2)

Solving
n = -21 + -18x + 3x2

Solving for variable 'n'.

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

Simplifying
n = -21 + -18x + 3x2

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