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x in (-oo:+oo)
x/9-4 = x/5 // - x/5
x/9-(x/5)-4 = 0
-4/45*x-4 = 0 // + 4
-4/45*x = 4 // : -4/45
x = 4/(-4/45)
x = -45
x = -45
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