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x in (-oo:+oo)
(-3/2)/3 = (4/5)*x // - (4/5)*x
(-3/2)/3-((4/5)*x) = 0
(-4/5)*x+(-3/2)/3 = 0
-4/5*x-1/2 = 0 // + 1/2
-4/5*x = 1/2 // : -4/5
x = 1/2/(-4/5)
x = -5/8
x = -5/8
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