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

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


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

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

Reorder the terms:
n = ((3xy + 3x2) + -21y * (x + 1y))
n = ((3xy + 3x2) + -21y * (x + 1y))
n = (3xy + 3x2 + (x * -21y + 1y * -21y))
n = (3xy + 3x2 + (-21xy + -21y2))

Reorder the terms:
n = (3xy + -21xy + 3x2 + -21y2)

Combine like terms: 3xy + -21xy = -18xy
n = (-18xy + 3x2 + -21y2)

Solving
n = -18xy + 3x2 + -21y2

Solving for variable 'n'.

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

Simplifying
n = -18xy + 3x2 + -21y2

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