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t in (-oo:+oo)
(3/10)*t = -7/4 // + -7/4
(3/10)*t-(-7/4) = 0
(3/10)*t+7/4 = 0
3/10*t+7/4 = 0 // - 7/4
3/10*t = -7/4 // : 3/10
t = -7/4/3/10
t = -35/6
t = -35/6
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