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7/5 = x/20-((5-x)/2) // - x/20-((5-x)/2)
(5-x)/2-(x/20)+7/5 = 0
(5-x)/2-x/20+7/5 = 0
(5*20*(5-x))/(2*5*20)+(2*5*(-x))/(2*5*20)+(2*7*20)/(2*5*20) = 0
5*20*(5-x)+2*5*(-x)+2*7*20 = 0
280-110*x+500 = 0
780-110*x = 0
(780-110*x)/(2*5*20) = 0
(780-110*x)/(2*5*20) = 0 // * 2*5*20
780-110*x = 0
780-110*x = 0 // - 780
-110*x = -780 // : -110
x = -780/(-110)
x = 78/11
x = 78/11
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