r=(4-0.25x)(25+2x)

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Solution for r=(4-0.25x)(25+2x) equation: 


Simplifying
r = (4 + -0.25x)(25 + 2x)

Multiply (4 + -0.25x) * (25 + 2x)
r = (4(25 + 2x) + -0.25x * (25 + 2x))
r = ((25 * 4 + 2x * 4) + -0.25x * (25 + 2x))
r = ((100 + 8x) + -0.25x * (25 + 2x))
r = (100 + 8x + (25 * -0.25x + 2x * -0.25x))
r = (100 + 8x + (-6.25x + -0.5x2))

Combine like terms: 8x + -6.25x = 1.75x
r = (100 + 1.75x + -0.5x2)

Solving
r = 100 + 1.75x + -0.5x2

Solving for variable 'r'.

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

Simplifying
r = 100 + 1.75x + -0.5x2

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