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t in (-oo:+oo)
-(4*t)-2 = -30 // + 30
30-(4*t)-2 = 0
30-4*t-2 = 0
28-4*t = 0 // - 28
-4*t = -28 // : -4
t = -28/(-4)
t = 7
t = 7
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