xa+3x=b

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Solution for xa+3x=b equation: 


Simplifying
xa + 3x = b

Solving
ax + 3x = b

Solving for variable 'a'.

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

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

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

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

Simplifying
a = bx-1 + -3

Reorder the terms:
a = -3 + bx-1

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