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t in (-oo:+oo)
3*t+4 = 40-6*t // - 40-6*t
3*t-(-6*t)-40+4 = 0
3*t+6*t-40+4 = 0
9*t-36 = 0 // + 36
9*t = 36 // : 9
t = 36/9
t = 4
t = 4
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