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t/21+119=128
We move all terms to the left:
t/21+119-(128)=0
We add all the numbers together, and all the variables
t/21-9=0
We multiply all the terms by the denominator
t-9*21=0
We add all the numbers together, and all the variables
t-189=0
We move all terms containing t to the left, all other terms to the right
t=189
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