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t in (-oo:+oo)
5*(7*t-2) = -220 // + 220
5*(7*t-2)+220 = 0
5*(7*t-2)+220 = 0
35*t+210 = 0
35*t+210 = 0
35*t+210 = 0 // - 210
35*t = -210 // : 35
t = -210/35
t = -6
t = -6
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