r=(500-10x)(20+1x)

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Solution for r=(500-10x)(20+1x) equation: 


Simplifying
r = (500 + -10x)(20 + 1x)

Multiply (500 + -10x) * (20 + 1x)
r = (500(20 + 1x) + -10x * (20 + 1x))
r = ((20 * 500 + 1x * 500) + -10x * (20 + 1x))
r = ((10000 + 500x) + -10x * (20 + 1x))
r = (10000 + 500x + (20 * -10x + 1x * -10x))
r = (10000 + 500x + (-200x + -10x2))

Combine like terms: 500x + -200x = 300x
r = (10000 + 300x + -10x2)

Solving
r = 10000 + 300x + -10x2

Solving for variable 'r'.

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

Simplifying
r = 10000 + 300x + -10x2

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