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t in (-oo:+oo)
(3/4)*t-(3*t)+9/10 = -261/10 // + -261/10
(3/4)*t-(3*t)+9/10-(-261/10) = 0
(3/4)*t-3*t+9/10+261/10 = 0
27-9/4*t = 0 // - 27
-9/4*t = -27 // : -9/4
t = -27/(-9/4)
t = 12
t = 12
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