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(12-((5/4)*x))*((12*x)/5-4) = 0
((-5/4)*x+12)*((12*x)/5-4) = 0
(12-5/4*x)*(12/5*x-4) = 0
( 12-5/4*x )
12-5/4*x = 0 // - 12
-5/4*x = -12 // : -5/4
x = -12/(-5/4)
x = 48/5
( 12/5*x-4 )
12/5*x-4 = 0 // + 4
12/5*x = 4 // : 12/5
x = 4/12/5
x = 5/3
x in { 48/5, 5/3 }
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