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x in (-oo:+oo)
9/5 = x/4 // - x/4
9/5-(x/4) = 0
9/5-1/4*x = 0 // - 9/5
-1/4*x = -9/5 // : -1/4
x = -9/5/(-1/4)
x = 36/5
x = 36/5
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