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t in (-oo:+oo)
7*(10-2*t) = -28 // + 28
7*(10-2*t)+28 = 0
7*(10-2*t)+28 = 0
98-14*t = 0
98-14*t = 0
98-14*t = 0 // - 98
-14*t = -98 // : -14
t = -98/(-14)
t = 7
t = 7
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