(-1/2)(8-r)

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Solution for (-1/2)(8-r) equation: 


r in (-oo:+oo)

(-1/2)*(8-r) = 0

-1/2*(8-r) = 0

( -1/2 )

-1/2 = 0

r belongs to the empty set

( 8-r )

8-r = 0 // - 8

-r = -8 // * -1

r = 8

r = 8

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