21=10x+9

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Solution for 21=10x+9 equation:


21=10x+9

We simplify the equation to the form, which is simple to understand 
21=10x+9

We move all terms containing x to the left and all other terms to the right. 
-10x=+9-21

We simplify left and right side of the equation. 
-10x=-12

We divide both sides of the equation by -010 to get x. 
x=1.2

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