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x in (-oo:+oo)
(-4/9)*x = 2.3 // - 2.3
(-4/9)*x-2.3 = 0
-4/9*x-2.3 = 0 // + 2.3
-4/9*x = 2.3 // : -4/9
x = 2.3/(-4/9)
x = -5.17500005
x = -5.17500005
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