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x in (-oo:+oo)
(16/45)*x = -4/9 // + -4/9
(16/45)*x-(-4/9) = 0
(16/45)*x+4/9 = 0
16/45*x+4/9 = 0 // - 4/9
16/45*x = -4/9 // : 16/45
x = -4/9/16/45
x = -5/4
x = -5/4
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