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