7-2b=21

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Solution for 7-2b=21 equation: 


Simplifying
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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