y=(20+x)(3000-100x)

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Solution for y=(20+x)(3000-100x) equation: 


Simplifying
y = (20 + x)(3000 + -100x)

Multiply (20 + x) * (3000 + -100x)
y = (20(3000 + -100x) + x(3000 + -100x))
y = ((3000 * 20 + -100x * 20) + x(3000 + -100x))
y = ((60000 + -2000x) + x(3000 + -100x))
y = (60000 + -2000x + (3000 * x + -100x * x))
y = (60000 + -2000x + (3000x + -100x2))

Combine like terms: -2000x + 3000x = 1000x
y = (60000 + 1000x + -100x2)

Solving
y = 60000 + 1000x + -100x2

Solving for variable 'y'.

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

Simplifying
y = 60000 + 1000x + -100x2

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