21+2t=t+84

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Solution for 21+2t=t+84 equation: 



21+2t=t+84

We move all terms to the left:

21+2t-(t+84)=0

We get rid of parentheses

2t-t-84+21=0

We add all the numbers together, and all the variables

t-63=0

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

t=63

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