A=x(20-x)

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Solution for A=x(20-x) equation: 


Simplifying
A = x(20 + -1x)
A = (20 * x + -1x * x)
A = (20x + -1x2)

Solving
A = 20x + -1x2

Solving for variable 'A'.

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

Simplifying
A = 20x + -1x2

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