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t in (-oo:+oo)
7*(3-(7*t)) = 364 // - 364
7*(3-(7*t))-364 = 0
7*(3-7*t)-364 = 0
7*(3-7*t)-364 = 0
-49*t-343 = 0
-49*t-343 = 0
-49*t-343 = 0 // + 343
-49*t = 343 // : -49
t = 343/(-49)
t = -7
t = -7
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