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t in (-oo:+oo)
7*(-3*t-5) = 196 // - 196
7*(-3*t-5)-196 = 0
7*(-3*t-5)-196 = 0
-21*t-231 = 0
-21*t-231 = 0
-21*t-231 = 0 // + 231
-21*t = 231 // : -21
t = 231/(-21)
t = -11
t = -11
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