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t in (-oo:+oo)
1-2*t = 2*t-15 // - 2*t-15
1-2*t-(2*t)+15 = 0
1-2*t-2*t+15 = 0
16-4*t = 0 // - 16
-4*t = -16 // : -4
t = -16/(-4)
t = 4
t = 4
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