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x in (-oo:+oo)
12 = (9*x)/2 // - (9*x)/2
12-((9*x)/2) = 0
(-9/2)*x+12 = 0
12-9/2*x = 0 // - 12
-9/2*x = -12 // : -9/2
x = -12/(-9/2)
x = 8/3
x = 8/3
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