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3-7t=5+3-21
We move all terms to the left:
3-7t-(5+3-21)=0
We add all the numbers together, and all the variables
-7t+3-(-13)=0
We add all the numbers together, and all the variables
-7t+16=0
We move all terms containing t to the left, all other terms to the right
-7t=-16
t=-16/-7
t=2+2/7
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