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x in (-oo:+oo)
(1/5)*x-90 = 2*x-9 // - 2*x-9
(1/5)*x-(2*x)-90+9 = 0
(1/5)*x-2*x-90+9 = 0
-9/5*x-81 = 0 // + 81
-9/5*x = 81 // : -9/5
x = 81/(-9/5)
x = -45
x = -45
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