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b in (-oo:+oo)
2*(5*b+2) = -56 // + 56
2*(5*b+2)+56 = 0
2*(5*b+2)+56 = 0
10*b+60 = 0
10*b+60 = 0
10*b+60 = 0 // - 60
10*b = -60 // : 10
b = -60/10
b = -6
b = -6
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