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x in (-oo:+oo)
(-2/3)*x-4 = 20 // - 20
(-2/3)*x-20-4 = 0
-2/3*x-24 = 0 // + 24
-2/3*x = 24 // : -2/3
x = 24/(-2/3)
x = -36
x = -36
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