-1/2b=-4

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Solution for -1/2b=-4 equation: 


b in (-oo:+oo)

(-1/2)*b = -4 // + 4

(-1/2)*b+4 = 0

4-1/2*b = 0 // - 4

-1/2*b = -4 // : -1/2

b = -4/(-1/2)

b = 8

b = 8

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