b=b-20

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Solution for b=b-20 equation: 


Simplifying
b = b + -20

Reorder the terms:
b = -20 + b

Add '-1b' to each side of the equation.
b + -1b = -20 + b + -1b

Combine like terms: b + -1b = 0
0 = -20 + b + -1b

Combine like terms: b + -1b = 0
0 = -20 + 0
0 = -20

Solving
0 = -20

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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