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