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13-12t=-15-10t
We move all terms to the left:
13-12t-(-15-10t)=0
We add all the numbers together, and all the variables
-12t-(-10t-15)+13=0
We get rid of parentheses
-12t+10t+15+13=0
We add all the numbers together, and all the variables
-2t+28=0
We move all terms containing t to the left, all other terms to the right
-2t=-28
t=-28/-2
t=+14
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