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12=7+5t
We move all terms to the left:
12-(7+5t)=0
We add all the numbers together, and all the variables
-(5t+7)+12=0
We get rid of parentheses
-5t-7+12=0
We add all the numbers together, and all the variables
-5t+5=0
We move all terms containing t to the left, all other terms to the right
-5t=-5
t=-5/-5
t=1
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