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t in (-oo:+oo)
7-(2*t) = 15 // - 15
7-(2*t)-15 = 0
7-2*t-15 = 0
-2*t-8 = 0 // + 8
-2*t = 8 // : -2
t = 8/(-2)
t = -4
t = -4
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