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x in (-oo:+oo)
(15*(x-1))/2 = 120 // - 120
(15*(x-1))/2-120 = 0
(15*(x-1))/2+(-120*2)/2 = 0
15*(x-1)-120*2 = 0
15*x-255 = 0
(15*x-255)/2 = 0
(15*x-255)/2 = 0 // * 2
15*x-255 = 0
15*x-255 = 0 // + 255
15*x = 255 // : 15
x = 255/15
x = 17
x = 17
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