87=91-t

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Solution for 87=91-t equation: 



87=91-t

We move all terms to the left:

87-(91-t)=0

We add all the numbers together, and all the variables

-(-1t+91)+87=0

We get rid of parentheses

1t-91+87=0

We add all the numbers together, and all the variables

t-4=0

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

t=4

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