21=2t+9

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Solution for 21=2t+9 equation:


21=2t+9

We simplify the equation to the form, which is simple to understand 
21=2t+9

We move all terms containing t to the left and all other terms to the right. 
-2t=+9-21

We simplify left and right side of the equation. 
-2t=-12

We divide both sides of the equation by -02 to get t. 
t=6

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