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x in (-oo:+oo)
(-9/4)*x = 8 // - 8
(-9/4)*x-8 = 0
-9/4*x-8 = 0 // + 8
-9/4*x = 8 // : -9/4
x = 8/(-9/4)
x = -32/9
x = -32/9
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