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t in (-oo:+oo)
7*(2*t-3) = 7 // - 7
7*(2*t-3)-7 = 0
7*(2*t-3)-7 = 0
14*t-28 = 0
14*t-28 = 0
14*t-28 = 0 // + 28
14*t = 28 // : 14
t = 28/14
t = 2
t = 2
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