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t in (-oo:+oo)
4*(2*t-5) = -12 // + 12
4*(2*t-5)+12 = 0
4*(2*t-5)+12 = 0
8*t-8 = 0
8*t-8 = 0
8*t-8 = 0 // + 8
8*t = 8 // : 8
t = 8/8
t = 1
t = 1
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