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13-t=5-7
We move all terms to the left:
13-t-(5-7)=0
We add all the numbers together, and all the variables
-t+13-(-2)=0
We add all the numbers together, and all the variables
-1t+15=0
We move all terms containing t to the left, all other terms to the right
-t=-15
t=-15/-1
t=+15
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