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19=13+t
We move all terms to the left:
19-(13+t)=0
We add all the numbers together, and all the variables
-(t+13)+19=0
We get rid of parentheses
-t-13+19=0
We add all the numbers together, and all the variables
-1t+6=0
We move all terms containing t to the left, all other terms to the right
-t=-6
t=-6/-1
t=+6
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