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(1+3)7=6t+21
We move all terms to the left:
(1+3)7-(6t+21)=0
We add all the numbers together, and all the variables
-(6t+21)+47=0
We get rid of parentheses
-6t-21+47=0
We add all the numbers together, and all the variables
-6t+26=0
We move all terms containing t to the left, all other terms to the right
-6t=-26
t=-26/-6
t=4+1/3
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