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x in (-oo:+oo)
(-2/9)*x-12 = 4 // - 4
(-2/9)*x-12-4 = 0
-2/9*x-16 = 0 // + 16
-2/9*x = 16 // : -2/9
x = 16/(-2/9)
x = -72
x = -72
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