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x in (-oo:+oo)
x-(((9*x)^1)/2)-4 = 0
x+(-9/2)*x-4 = 0
-7/2*x-4 = 0 // + 4
-7/2*x = 4 // : -7/2
x = 4/(-7/2)
x = -8/7
x = -8/7
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