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12t+(1-7t)=13
We move all terms to the left:
12t+(1-7t)-(13)=0
We add all the numbers together, and all the variables
12t+(-7t+1)-13=0
We get rid of parentheses
12t-7t+1-13=0
We add all the numbers together, and all the variables
5t-12=0
We move all terms containing t to the left, all other terms to the right
5t=12
t=12/5
t=2+2/5
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