20t-1=90

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Solution for 20t-1=90 equation: 



20t-1=90

We move all terms to the left:

20t-1-(90)=0

We add all the numbers together, and all the variables

20t-91=0

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

20t=91

t=91/20

t=4+11/20

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