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t in (-oo:+oo)
15 = 4*t-6*t+7 // - 4*t-6*t+7
15-(-6*t)-(4*t)-7 = 0
6*t-4*t-7+15 = 0
2*t+8 = 0 // - 8
2*t = -8 // : 2
t = -8/2
t = -4
t = -4
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