3x+9=2x+21

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Solution for 3x+9=2x+21 equation:


3x+9=2x+21

We simplify the equation to the form, which is simple to understand 
3x+9=2x+21

We move all terms containing x to the left and all other terms to the right. 
+3x-2x=+21-9

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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