4=-2b+4b-4

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


b in (-oo:+oo)

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

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

2*b-4*b+4+4 = 0

8-2*b = 0 // - 8

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

b = -8/(-2)

b = 4

b = 4

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