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T in (-oo:+oo)
(2/5)*(T-70)+70 = 0
2/5*(T-70)+70 = 0
2/5*(T-70)+70 = 0
2/5*T+42 = 0
2/5*T+42 = 0
2/5*T+42 = 0 // - 42
2/5*T = -42 // : 2/5
T = -42/2/5
T = -105
T = -105
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