21-8x-4+9x=

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Solution for 21-8x-4+9x= equation:


21-8x-4+9x=0

We simplify the equation to the form, which is simple to understand 
21-8x-4+9x=0

We move all terms containing x to the left and all other terms to the right. 
-8x+9x=0-21+4

We simplify left and right side of the equation. 
+1x=-17

We divide both sides of the equation by 1 to get x. 
x=-17

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