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x in (-oo:+oo)
x/(-15)-3 = 7-15 // - 7-15
x/(-15)-7-3+15 = 0
5-1/15*x = 0 // - 5
-1/15*x = -5 // : -1/15
x = -5/(-1/15)
x = 75
x = 75
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