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120=-5t^2+10t
We move all terms to the left:
120-(-5t^2+10t)=0
We get rid of parentheses
5t^2-10t+120=0
a = 5; b = -10; c = +120;
Δ = b2-4ac
Δ = -102-4·5·120
Δ = -2300
Delta is less than zero, so there is no solution for the equation
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