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x in (-oo:+oo)
(1/5)*x-4 = 2*(x-(19/5)) // - 2*(x-(19/5))
(1/5)*x-(2*(x-(19/5)))-4 = 0
(1/5)*x-2*(x-19/5)-4 = 0
x/5-2*(x-19/5)-4 = 0
(-2*5*(x-19/5))/5+x/5+(-4*5)/5 = 0
x-2*5*(x-19/5)-4*5 = 0
38-9*x-20 = 0
18-9*x = 0
(18-9*x)/5 = 0
(18-9*x)/5 = 0 // * 5
18-9*x = 0
18-9*x = 0 // - 18
-9*x = -18 // : -9
x = -18/(-9)
x = 2
x = 2
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