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t in (-oo:+oo)
4*(3*t+1) = 100 // - 100
4*(3*t+1)-100 = 0
4*(3*t+1)-100 = 0
12*t-96 = 0
12*t-96 = 0
12*t-96 = 0 // + 96
12*t = 96 // : 12
t = 96/12
t = 8
t = 8
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