3x+21=4x+9

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Solution for 3x+21=4x+9 equation:


3x+21=4x+9

We simplify the equation to the form, which is simple to understand 
3x+21=4x+9

We move all terms containing x to the left and all other terms to the right. 
+3x-4x=+9-21

We simplify left and right side of the equation. 
-1x=-12

We divide both sides of the equation by -1 to get x. 
x=12

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