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x in (-oo:+oo)
1/9-((9*x)/4) = 0
(-9/4)*x+1/9 = 0
1/9-9/4*x = 0 // - 1/9
-9/4*x = -1/9 // : -9/4
x = -1/9/(-9/4)
x = 4/81
x = 4/81
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