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x in (-oo:+oo)
(1/20)*(4*x-10) = x+5 // - x+5
(1/20)*(4*x-10)-x-5 = 0
1/20*(4*x-10)-x-5 = 0
1/20*(4*x-10)-x-5 = 0
-4/5*x-5-1/2 = 0
-4/5*x-11/2 = 0
-4/5*x-11/2 = 0
-4/5*x-11/2 = 0 // + 11/2
-4/5*x = 11/2 // : -4/5
x = 11/2/(-4/5)
x = -55/8
x = -55/8
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