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5t^2=10t-480=0
We move all terms to the left:
5t^2-(10t-480)=0
We get rid of parentheses
5t^2-10t+480=0
a = 5; b = -10; c = +480;
Δ = b2-4ac
Δ = -102-4·5·480
Δ = -9500
Delta is less than zero, so there is no solution for the equation
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