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213=6t+39
We move all terms to the left:
213-(6t+39)=0
We get rid of parentheses
-6t-39+213=0
We add all the numbers together, and all the variables
-6t+174=0
We move all terms containing t to the left, all other terms to the right
-6t=-174
t=-174/-6
t=+29
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