b-3b=-9

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Solution for b-3b=-9 equation: 


Simplifying
b + -3b = -9

Combine like terms: b + -3b = -2b
-2b = -9

Solving
-2b = -9

Solving for variable 'b'.

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

Divide each side by '-2'.
b = 4.5

Simplifying
b = 4.5

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