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t in (-oo:+oo)
-70 = -5*t-(4*t)-7 // + -5*t-(4*t)-7
4*t-(-5*t)-70+7 = 0
5*t+4*t-70+7 = 0
9*t-63 = 0 // + 63
9*t = 63 // : 9
t = 63/9
t = 7
t = 7
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