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