S=a(a-r)

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Solution for S=a(a-r) equation: 


Simplifying
S = a(a + -1r)
S = (a * a + -1r * a)

Reorder the terms:
S = (-1ar + a2)
S = (-1ar + a2)

Solving
S = -1ar + a2

Solving for variable 'S'.

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

Simplifying
S = -1ar + a2

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