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t in (-oo:+oo)
3*t+5 = 105-7*t // - 105-7*t
3*t-(-7*t)-105+5 = 0
3*t+7*t-105+5 = 0
10*t-100 = 0 // + 100
10*t = 100 // : 10
t = 100/10
t = 10
t = 10
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