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0=-10t^+30t
We move all terms to the left:
0-(-10t^+30t)=0
We add all the numbers together, and all the variables
-(-10t^+30t)=0
We get rid of parentheses
10t^-30t=0
We add all the numbers together, and all the variables
-20t=0
t=0/-20
t=0
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