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50.5+70t=390
We move all terms to the left:
50.5+70t-(390)=0
We add all the numbers together, and all the variables
70t-339.5=0
We move all terms containing t to the left, all other terms to the right
70t=339.5
t=339.5/70
t=4+39.666666666667/46.666666666667
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