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t in (-oo:+oo)
7*t-2 = -4*t-123 // + -4*t-123
7*t-(-4*t)-2+123 = 0
7*t+4*t-2+123 = 0
11*t+121 = 0 // - 121
11*t = -121 // : 11
t = -121/11
t = -11
t = -11
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