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x in (-oo:+oo)
36 = (9/2)*x // - (9/2)*x
36-((9/2)*x) = 0
(-9/2)*x+36 = 0
36-9/2*x = 0 // - 36
-9/2*x = -36 // : -9/2
x = -36/(-9/2)
x = 8
x = 8
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