a+x*y=b

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Solution for a+x*y=b equation: 


Simplifying
a + x * y = b

Multiply x * y
a + xy = b

Solving
a + xy = b

Solving for variable 'a'.

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

Add '-1xy' to each side of the equation.
a + xy + -1xy = b + -1xy

Combine like terms: xy + -1xy = 0
a + 0 = b + -1xy
a = b + -1xy

Simplifying
a = b + -1xy

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