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x in (-oo:+oo)
(-2/3)*x-6 = 4 // - 4
(-2/3)*x-6-4 = 0
-2/3*x-10 = 0 // + 10
-2/3*x = 10 // : -2/3
x = 10/(-2/3)
x = -15
x = -15
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