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x in (-oo:+oo)
-8 = (4/9)*x // - (4/9)*x
-((4/9)*x)-8 = 0
(-4/9)*x-8 = 0
-4/9*x-8 = 0 // + 8
-4/9*x = 8 // : -4/9
x = 8/(-4/9)
x = -18
x = -18
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