21=1-4b-8

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Solution for 21=1-4b-8 equation:


21=1-4b-8

We simplify the equation to the form, which is simple to understand 
21=1-4b-8

We move all terms containing b to the left and all other terms to the right. 
+4b=+1-8-21

We simplify left and right side of the equation. 
+4b=-28

We divide both sides of the equation by 04 to get b. 
b=-7

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