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t in (-oo:+oo)
-((5/7)*t)-(7*t)-3 = -183/7 // + -183/7
-((5/7)*t)-(7*t)-(-183/7)-3 = 0
(-5/7)*t-7*t+183/7-3 = 0
162/7-54/7*t = 0 // - 162/7
-54/7*t = -162/7 // : -54/7
t = -162/7/(-54/7)
t = 3
t = 3
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