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x in (-oo:+oo)
(-4/9)*x = 3/5 // - 3/5
(-4/9)*x-(3/5) = 0
(-4/9)*x-3/5 = 0
-4/9*x-3/5 = 0 // + 3/5
-4/9*x = 3/5 // : -4/9
x = 3/5/(-4/9)
x = -27/20
x = -27/20
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