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x in (-oo:+oo)
-2/3 = (2*x)/4 // - (2*x)/4
-((2*x)/4)-2/3 = 0
(-1/2)*x-2/3 = 0
-1/2*x-2/3 = 0 // + 2/3
-1/2*x = 2/3 // : -1/2
x = 2/3/(-1/2)
x = -4/3
x = -4/3
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