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x in (-oo:+oo)
(-7/9)*x = 3 // - 3
(-7/9)*x-3 = 0
-7/9*x-3 = 0 // + 3
-7/9*x = 3 // : -7/9
x = 3/(-7/9)
x = -27/7
x = -27/7
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