-12=-4b+b-9

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Solution for -12=-4b+b-9 equation: 


b in (-oo:+oo)

-12 = b-4*b-9 // - b-4*b-9

9-(-4*b)-b-12 = 0

4*b-b-12+9 = 0

3*b-3 = 0 // + 3

3*b = 3 // : 3

b = 3/3

b = 1

b = 1

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