89=2t+21

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Solution for 89=2t+21 equation: 



89=2t+21

We move all terms to the left:

89-(2t+21)=0

We get rid of parentheses

-2t-21+89=0

We add all the numbers together, and all the variables

-2t+68=0

We move all terms containing t to the left, all other terms to the right

-2t=-68

t=-68/-2

t=+34

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