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t in (-oo:+oo)
2*(4*t+10) = 84 // - 84
2*(4*t+10)-84 = 0
2*(4*t+10)-84 = 0
8*t-64 = 0
8*t-64 = 0
8*t-64 = 0 // + 64
8*t = 64 // : 8
t = 64/8
t = 8
t = 8
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