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x in (-oo:+oo)
9-((3*x)/2) = 13 // - 13
9-((3*x)/2)-13 = 0
(-3/2)*x-13+9 = 0
-3/2*x-4 = 0 // + 4
-3/2*x = 4 // : -3/2
x = 4/(-3/2)
x = -8/3
x = -8/3
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