21=10-2t

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Solution for 21=10-2t equation: 



21=10-2t

We move all terms to the left:

21-(10-2t)=0

We add all the numbers together, and all the variables

-(-2t+10)+21=0

We get rid of parentheses

2t-10+21=0

We add all the numbers together, and all the variables

2t+11=0

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

2t=-11

t=-11/2

t=-5+1/2

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