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61=6t-5t^2
We move all terms to the left:
61-(6t-5t^2)=0
We get rid of parentheses
5t^2-6t+61=0
a = 5; b = -6; c = +61;
Δ = b2-4ac
Δ = -62-4·5·61
Δ = -1184
Delta is less than zero, so there is no solution for the equation
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