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-4.5t^2+10t=20
We move all terms to the left:
-4.5t^2+10t-(20)=0
a = -4.5; b = 10; c = -20;
Δ = b2-4ac
Δ = 102-4·(-4.5)·(-20)
Δ = -260
Delta is less than zero, so there is no solution for the equation
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