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t in (-oo:+oo)
-7*t-10 = -3*t-42 // + -3*t-42
42-7*t-(-3*t)-10 = 0
3*t-7*t-10+42 = 0
32-4*t = 0 // - 32
-4*t = -32 // : -4
t = -32/(-4)
t = 8
t = 8
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