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t in (-oo:+oo)
3*t-((3/5)*t)-(9/10) = 3/10 // - 3/10
3*t-((3/5)*t)-(9/10)-(3/10) = 0
3*t+(-3/5)*t-9/10-3/10 = 0
12/5*t-6/5 = 0 // + 6/5
12/5*t = 6/5 // : 12/5
t = 6/5/12/5
t = 1/2
t = 1/2
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