21=2-6b+1

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Solution for 21=2-6b+1 equation:


21=2-6b+1

We simplify the equation to the form, which is simple to understand 
21=2-6b+1

We move all terms containing b to the left and all other terms to the right. 
+6b=+2+1-21

We simplify left and right side of the equation. 
+6b=-18

We divide both sides of the equation by 06 to get b. 
b=-3

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