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t in (-oo:+oo)
-(4*t)-7 = -6*t-13 // + -6*t-13
13-(4*t)-(-6*t)-7 = 0
6*t-4*t-7+13 = 0
2*t+6 = 0 // - 6
2*t = -6 // : 2
t = -6/2
t = -3
t = -3
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