3x+12-x=30

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Solution for 3x+12-x=30 equation:


3x+12-x=30

We simplify the equation to the form, which is simple to understand 
3x+12-x=30

We move all terms containing x to the left and all other terms to the right. 
+3x-1x=+30-12

We simplify left and right side of the equation. 
+2x=+18

We divide both sides of the equation by 2 to get x. 
x=9

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