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6=-4.9^2t+26
We move all terms to the left:
6-(-4.9^2t+26)=0
We get rid of parentheses
4.9^2t-26+6=0
We add all the numbers together, and all the variables
4.9^2t-20=0
We move all terms containing t to the left, all other terms to the right
4.9^2t=20
t=20/1
t=20
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