12+x-21=4

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Solution for 12+x-21=4 equation:


12+x-21=4

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

We move all terms containing x to the left and all other terms to the right. 
+1x=+4-12+21

We simplify left and right side of the equation. 
+1x=+13

We divide both sides of the equation by 1 to get x. 
x=13

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