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x in (-oo:+oo)
(1*50)/20 = (1*20*x)/20 // - (1*20*x)/20
(1*50)/20-((1*20*x)/20) = 0
50/20-x = 0
5/2-x = 0 // - 5/2
-x = -5/2 // * -1
x = 5/2
x = 5/2
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