15=20t-4.9^2

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Solution for 15=20t-4.9^2 equation: 



15=20t-4.9^2

We move all terms to the left:

15-(20t-4.9^2)=0

We get rid of parentheses

-20t+15+4.9^2=0

We add all the numbers together, and all the variables

-20t+39.01=0

We move all terms containing t to the left, all other terms to the right

-20t=-39.01

t=-39.01/-20

t=1+18.821782178218/19.80198019802

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