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7t=-8+9t
We move all terms to the left:
7t-(-8+9t)=0
We add all the numbers together, and all the variables
7t-(9t-8)=0
We get rid of parentheses
7t-9t+8=0
We add all the numbers together, and all the variables
-2t+8=0
We move all terms containing t to the left, all other terms to the right
-2t=-8
t=-8/-2
t=+4
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