x+3*7=

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Solution for x+3*7= equation:


x+3*7=0

We simplify the equation to the form, which is simple to understand 
x+3*7=0

Simplifying:
x+21=0

We move all terms containing x to the left and all other terms to the right. 
+1x=0-21

We simplify left and right side of the equation. 
+1x=-21

We divide both sides of the equation by 1 to get x. 
x=-21

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