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(5-x)/4 = 4*x // - 4*x
(5-x)/4-(4*x) = 0
(5-x)/4-4*x = 0
(5-x)/4+(-4*4*x)/4 = 0
5-x-4*4*x = 0
5-17*x = 0
(5-17*x)/4 = 0
(5-17*x)/4 = 0 // * 4
5-17*x = 0
5-17*x = 0 // - 5
-17*x = -5 // : -17
x = -5/(-17)
x = 5/17
x = 5/17
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