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x in (-oo:+oo)
-5 = x/15+3 // - x/15+3
-(x/15)-5-3 = 0
-1/15*x-8 = 0 // + 8
-1/15*x = 8 // : -1/15
x = 8/(-1/15)
x = -120
x = -120
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