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x in (-oo:+oo)
-4*x = 20/3 // - 20/3
-4*x-(20/3) = 0
-4*x-20/3 = 0
-4*x-20/3 = 0 // + 20/3
-4*x = 20/3 // : -4
x = 20/3/(-4)
x = -5/3
x = -5/3
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