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50=0+0.5*9.8*t(^)
We move all terms to the left:
50-(0+0.5*9.8*t(^))=0
We get rid of parentheses
-0.5*9.8*t^-0+50=0
We add all the numbers together, and all the variables
-0.5*9.8*t^+50=0
We move all terms containing t to the left, all other terms to the right
-0.5*9.8*t^=-50
t=-50/1
t=-50
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