2b-4b=-20

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Solution for 2b-4b=-20 equation: 


Simplifying
2b + -4b = -20

Combine like terms: 2b + -4b = -2b
-2b = -20

Solving
-2b = -20

Solving for variable 'b'.

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

Divide each side by '-2'.
b = 10

Simplifying
b = 10

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