2b+(-7)=-21

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Solution for 2b+(-7)=-21 equation: 


Simplifying
2b + (-7) = -21
2b + -7 = -21

Reorder the terms:
-7 + 2b = -21

Solving
-7 + 2b = -21

Solving for variable 'b'.

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

Add '7' to each side of the equation.
-7 + 7 + 2b = -21 + 7

Combine like terms: -7 + 7 = 0
0 + 2b = -21 + 7
2b = -21 + 7

Combine like terms: -21 + 7 = -14
2b = -14

Divide each side by '2'.
b = -7

Simplifying
b = -7

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