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170=30t+50
We move all terms to the left:
170-(30t+50)=0
We get rid of parentheses
-30t-50+170=0
We add all the numbers together, and all the variables
-30t+120=0
We move all terms containing t to the left, all other terms to the right
-30t=-120
t=-120/-30
t=+4
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