yr+ya=ur

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Solution for yr+ya=ur equation: 


Simplifying
yr + ya = ur

Reorder the terms:
ay + ry = ur

Solving
ay + ry = ru

Solving for variable 'a'.

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

Add '-1ry' to each side of the equation.
ay + ry + -1ry = ru + -1ry

Combine like terms: ry + -1ry = 0
ay + 0 = ru + -1ry
ay = ru + -1ry

Divide each side by 'y'.
a = ruy-1 + -1r

Simplifying
a = ruy-1 + -1r

Reorder the terms:
a = -1r + ruy-1

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