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x in (-oo:+oo)
6.5/9 = x/40 // - x/40
6.5/9-(x/40) = 0
0.72222222-1/40*x = 0 // - 0.72222222
-1/40*x = -0.72222222 // : -1/40
x = -0.72222222/(-1/40)
x = 28.8888888
x = 28.8888888
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