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