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50=-10t+89
We move all terms to the left:
50-(-10t+89)=0
We get rid of parentheses
10t-89+50=0
We add all the numbers together, and all the variables
10t-39=0
We move all terms containing t to the left, all other terms to the right
10t=39
t=39/10
t=3+9/10
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