x+x-10x+21=0

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Solution for x+x-10x+21=0 equation:


x+x-10x+21=0

We simplify the equation to the form, which is simple to understand 
x+x-10x+21=0

We move all terms containing x to the left and all other terms to the right. 
+1x+1x-10x=0-21

We simplify left and right side of the equation. 
-8x=-21

We divide both sides of the equation by -8 to get x. 
x=2.625

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