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(5-x)/2 = x/20 // - x/20
(5-x)/2-(x/20) = 0
(5-x)/2-x/20 = 0
(20*(5-x))/(2*20)+(2*(-x))/(2*20) = 0
20*(5-x)+2*(-x) = 0
100-22*x = 0
(100-22*x)/(2*20) = 0
(100-22*x)/(2*20) = 0 // * 2*20
100-22*x = 0
100-22*x = 0 // - 100
-22*x = -100 // : -22
x = -100/(-22)
x = 50/11
x = 50/11
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