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x in (-oo:+oo)
-40 = x/3-15 // - x/3-15
15-(x/3)-40 = 0
-1/3*x-25 = 0 // + 25
-1/3*x = 25 // : -1/3
x = 25/(-1/3)
x = -75
x = -75
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