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(480*x-(10*x^2))/30 = 0
(480*x-10*x^2)/30 = 0
480*x-10*x^2 = 0
10*x*(48-x) = 0
48-x = 0 // - 48
-x = -48 // * -1
x = 48
10*x*(x-48) = 0
(10*x*(x-48))/30 = 0
( 10*x )
10*x = 0 // : 10
x = 0
( x-48 )
x-48 = 0 // + 48
x = 48
x in { 0, 48 }
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