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x in (-oo:+oo)
-2*x-4 = (1/2)*x-3/2 // - (1/2)*x-3/2
-2*x-((1/2)*x)-(-3/2)-4 = 0
(-1/2)*x-2*x+3/2-4 = 0
-5/2*x-5/2 = 0 // + 5/2
-5/2*x = 5/2 // : -5/2
x = 5/2/(-5/2)
x = -1
x = -1
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