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t in (-oo:+oo)
10-7*t = -3*t-30 // + -3*t-30
10-7*t-(-3*t)+30 = 0
3*t-7*t+10+30 = 0
40-4*t = 0 // - 40
-4*t = -40 // : -4
t = -40/(-4)
t = 10
t = 10
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