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