-15=-4b+2b-1

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Solution for -15=-4b+2b-1 equation: 


b in (-oo:+oo)

-15 = 2*b-4*b-1 // - 2*b-4*b-1

1-(-4*b)-(2*b)-15 = 0

4*b-2*b-15+1 = 0

2*b-14 = 0 // + 14

2*b = 14 // : 2

b = 14/2

b = 7

b = 7

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