21=3(3x+1)

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Solution for 21=3(3x+1) equation:


21=3(3x+1) 

We simplify the equation to the form, which is simple to understand 
21=3(3x+1)

Reorder the terms in parentheses
21=+(+9x+3)

Remove unnecessary parentheses
+21=+9x+3

We move all terms containing x to the left and all other terms to the right. 
-9x=+3-21

We simplify left and right side of the equation. 
-9x=-18

We divide both sides of the equation by -09 to get x. 
x=2

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