[3+x]=12

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Solution for [3+x]=12 equation:


[3+x]=12

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

Remove unnecessary parentheses
3+x=12

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

We simplify left and right side of the equation. 
+1x=+9

We divide both sides of the equation by 1 to get x. 
x=9

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