r=(90-3x)(12+x)

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Solution for r=(90-3x)(12+x) equation: 


Simplifying
r = (90 + -3x)(12 + x)

Multiply (90 + -3x) * (12 + x)
r = (90(12 + x) + -3x * (12 + x))
r = ((12 * 90 + x * 90) + -3x * (12 + x))
r = ((1080 + 90x) + -3x * (12 + x))
r = (1080 + 90x + (12 * -3x + x * -3x))
r = (1080 + 90x + (-36x + -3x2))

Combine like terms: 90x + -36x = 54x
r = (1080 + 54x + -3x2)

Solving
r = 1080 + 54x + -3x2

Solving for variable 'r'.

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

Simplifying
r = 1080 + 54x + -3x2

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