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(-2t)+(-7t)=18
We move all terms to the left:
(-2t)+(-7t)-(18)=0
We get rid of parentheses
-2t-7t-18=0
We add all the numbers together, and all the variables
-9t-18=0
We move all terms containing t to the left, all other terms to the right
-9t=18
t=18/-9
t=-2
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