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t in (-oo:+oo)
6-(7*t) = 90 // - 90
6-(7*t)-90 = 0
6-7*t-90 = 0
-7*t-84 = 0 // + 84
-7*t = 84 // : -7
t = 84/(-7)
t = -12
t = -12
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