-1-4b=-21

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


Simplifying
-1 + -4b = -21

Solving
-1 + -4b = -21

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + -4b = -21 + 1

Combine like terms: -1 + 1 = 0
0 + -4b = -21 + 1
-4b = -21 + 1

Combine like terms: -21 + 1 = -20
-4b = -20

Divide each side by '-4'.
b = 5

Simplifying
b = 5

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