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68=9t-4
We move all terms to the left:
68-(9t-4)=0
We get rid of parentheses
-9t+4+68=0
We add all the numbers together, and all the variables
-9t+72=0
We move all terms containing t to the left, all other terms to the right
-9t=-72
t=-72/-9
t=+8
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