-2b=-4

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Solution for -2b=-4 equation: 


b in (-oo:+oo)

-2*b = -4 // + 4

4-2*b = 0

4-2*b = 0 // - 4

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

b = -4/(-2)

b = 2

b = 2

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