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t in (-oo:+oo)
2*t-(9/10) = -5/2 // + -5/2
2*t-(9/10)-(-5/2) = 0
2*t-9/10+5/2 = 0
2*t+8/5 = 0 // - 8/5
2*t = -8/5 // : 2
t = -8/5/2
t = -4/5
t = -4/5
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