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b in (-oo:+oo)
2*(5*b+8) = -4 // + 4
2*(5*b+8)+4 = 0
2*(5*b+8)+4 = 0
10*b+20 = 0
10*b+20 = 0
10*b+20 = 0 // - 20
10*b = -20 // : 10
b = -20/10
b = -2
b = -2
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