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x in (-oo:+oo)
30 = (x+25)/15 // - (x+25)/15
30-((x+25)/15) = 0
(-1*(x+25))/15+30 = 0
(-1*(x+25))/15+(15*30)/15 = 0
15*30-1*(x+25) = 0
425-x = 0
(425-x)/15 = 0
(425-x)/15 = 0 // * 15
425-x = 0
425-x = 0 // - 425
-x = -425 // * -1
x = 425
x = 425
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