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t in (-oo:+oo)
5*(5-2*t) = 55 // - 55
5*(5-2*t)-55 = 0
5*(5-2*t)-55 = 0
-10*t-30 = 0
-10*t-30 = 0
-10*t-30 = 0 // + 30
-10*t = 30 // : -10
t = 30/(-10)
t = -3
t = -3
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