21=3+2.t

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Solution for 21=3+2.t equation: 



21=3+2.t

We move all terms to the left:

21-(3+2.t)=0

We add all the numbers together, and all the variables

-(2.t+3)+21=0

We get rid of parentheses

-2.t-3+21=0

We add all the numbers together, and all the variables

-2t+18=0

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

-2t=-18

t=-18/-2

t=+9

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