3b+ab=x

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Solution for 3b+ab=x equation: 


Simplifying
3b + ab = x

Reorder the terms:
ab + 3b = x

Solving
ab + 3b = x

Solving for variable 'a'.

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

Add '-3b' to each side of the equation.
ab + 3b + -3b = -3b + x

Combine like terms: 3b + -3b = 0
ab + 0 = -3b + x
ab = -3b + x

Divide each side by 'b'.
a = -3 + b-1x

Simplifying
a = -3 + b-1x

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