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x in (-oo:+oo)
-3/8 = x/40 // - x/40
-(x/40)-3/8 = 0
-1/40*x-3/8 = 0 // + 3/8
-1/40*x = 3/8 // : -1/40
x = 3/8/(-1/40)
x = -15
x = -15
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