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(93+80+t)/3=90
We move all terms to the left:
(93+80+t)/3-(90)=0
We add all the numbers together, and all the variables
(t+173)/3-90=0
We multiply all the terms by the denominator
(t+173)-90*3=0
We add all the numbers together, and all the variables
(t+173)-270=0
We get rid of parentheses
t+173-270=0
We add all the numbers together, and all the variables
t-97=0
We move all terms containing t to the left, all other terms to the right
t=97
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