s=1/2(a-b)x find b

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s=1/2(a-b)x
s = 1/2(xa) - 1/2(xb)
s - 1/2(xa) = - 1/2(xb)
multiply both sides by -2
-2s + xa = xb
divide both sides by x
(-2s + xa)/x = b

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