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4t-9=-2-1+7t
We move all terms to the left:
4t-9-(-2-1+7t)=0
We add all the numbers together, and all the variables
4t-(7t-3)-9=0
We get rid of parentheses
4t-7t+3-9=0
We add all the numbers together, and all the variables
-3t-6=0
We move all terms containing t to the left, all other terms to the right
-3t=6
t=6/-3
t=-2
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