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19=12+7t
We move all terms to the left:
19-(12+7t)=0
We add all the numbers together, and all the variables
-(7t+12)+19=0
We get rid of parentheses
-7t-12+19=0
We add all the numbers together, and all the variables
-7t+7=0
We move all terms containing t to the left, all other terms to the right
-7t=-7
t=-7/-7
t=1
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