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x in (-oo:+oo)
(4/9)*x+3 = (-5/9)*x-4 // - (-5/9)*x-4
(4/9)*x-((-5/9)*x)+3+4 = 0
(4/9)*x+(5/9)*x+3+4 = 0
x+7 = 0 // - 7
x = -7
x = -7
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