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x in (-oo:+oo)
(-4/3)*x = 6 // - 6
(-4/3)*x-6 = 0
-4/3*x-6 = 0 // + 6
-4/3*x = 6 // : -4/3
x = 6/(-4/3)
x = -9/2
x = -9/2
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