-2b-4=-12

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Solution for -2b-4=-12 equation: 


b in (-oo:+oo)

-2*b-4 = -12 // + 12

12-2*b-4 = 0

8-2*b = 0 // - 8

-2*b = -8 // : -2

b = -8/(-2)

b = 4

b = 4

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