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xa=x+ab
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by a.
xa-ab=x
Subtract ab from both sides.
\left(x-b\right)a=x
Combine all terms containing a.
\frac{\left(x-b\right)a}{x-b}=\frac{x}{x-b}
Divide both sides by x-b.
a=\frac{x}{x-b}
Dividing by x-b undoes the multiplication by x-b.
a=\frac{x}{x-b}\text{, }a\neq 0
Variable a cannot be equal to 0.
xa=x+ab
Multiply both sides of the equation by a.
x+ab=xa
Swap sides so that all variable terms are on the left hand side.
ab=xa-x
Subtract x from both sides.
ab=ax-x
The equation is in standard form.
\frac{ab}{a}=\frac{x\left(a-1\right)}{a}
Divide both sides by a.
b=\frac{x\left(a-1\right)}{a}
Dividing by a undoes the multiplication by a.