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