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-72=10t+2t
We move all terms to the left:
-72-(10t+2t)=0
We add all the numbers together, and all the variables
-(+12t)-72=0
We get rid of parentheses
-12t-72=0
We move all terms containing t to the left, all other terms to the right
-12t=72
t=72/-12
t=-6
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