21=-2t+75

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Solution for 21=-2t+75 equation: 



21=-2t+75

We move all terms to the left:

21-(-2t+75)=0

We get rid of parentheses

2t-75+21=0

We add all the numbers together, and all the variables

2t-54=0

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

2t=54

t=54/2

t=27

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