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t in (-oo:+oo)
5*(-(7*t)-2) = -255 // + 255
5*(-(7*t)-2)+255 = 0
5*(-7*t-2)+255 = 0
5*(-7*t-2)+255 = 0
245-35*t = 0
245-35*t = 0
245-35*t = 0 // - 245
-35*t = -245 // : -35
t = -245/(-35)
t = 7
t = 7
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