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x in (-oo:+oo)
2/5-(x/15) = 2 // - 2
2/5-(x/15)-2 = 0
-1/15*x-8/5 = 0 // + 8/5
-1/15*x = 8/5 // : -1/15
x = 8/5/(-1/15)
x = -24
x = -24
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