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x in (-oo:+oo)
(-5/9)*x = 2/1 // - 2/1
(-5/9)*x-(2/1) = 0
(-5/9)*x-2 = 0
-5/9*x-2 = 0 // + 2
-5/9*x = 2 // : -5/9
x = 2/(-5/9)
x = -18/5
x = -18/5
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