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x in (-oo:+oo)
2/5-9*x = 4 // - 4
2/5-9*x-4 = 0
-9*x-18/5 = 0 // + 18/5
-9*x = 18/5 // : -9
x = 18/5/(-9)
x = -2/5
x = -2/5
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