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t in (-oo:+oo)
10-4*t = 15-3*t // - 15-3*t
10-4*t-(-3*t)-15 = 0
3*t-4*t-15+10 = 0
-t-5 = 0 // + 5
-t = 5 // * -1
t = -5
t = -5
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