7/10=21/x

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Solution for 7/10=21/x equation:


7/10=21/x

We simplify the equation to the form, which is simple to understand 
7/10=21/x

We move all terms containing x to the left and all other terms to the right. 
-1x=-0.7

We simplify left and right side of the equation. 
-1x=-0.7

We divide both sides of the equation by -01 to get x. 
x=0.7

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