r=(100-20x)(75+1x)

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Solution for r=(100-20x)(75+1x) equation: 


Simplifying
r = (100 + -20x)(75 + 1x)

Multiply (100 + -20x) * (75 + 1x)
r = (100(75 + 1x) + -20x * (75 + 1x))
r = ((75 * 100 + 1x * 100) + -20x * (75 + 1x))
r = ((7500 + 100x) + -20x * (75 + 1x))
r = (7500 + 100x + (75 * -20x + 1x * -20x))
r = (7500 + 100x + (-1500x + -20x2))

Combine like terms: 100x + -1500x = -1400x
r = (7500 + -1400x + -20x2)

Solving
r = 7500 + -1400x + -20x2

Solving for variable 'r'.

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

Simplifying
r = 7500 + -1400x + -20x2

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