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x in (-oo:+oo)
-2 = (x-100)/15 // - (x-100)/15
-((x-100)/15)-2 = 0
(-1*(x-100))/15-2 = 0
(-1*(x-100))/15+(-2*15)/15 = 0
-1*(x-100)-2*15 = 0
70-x = 0
(70-x)/15 = 0
(70-x)/15 = 0 // * 15
70-x = 0
70-x = 0 // - 70
-x = -70 // * -1
x = 70
x = 70
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