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b in (-oo:+oo)
(4*b+8)/(-2) = 10 // - 10
(4*b+8)/(-2)-10 = 0
(4*b+8)/(-2)+(-10*(-2))/(-2) = 0
4*b-10*(-2)+8 = 0
4*b+28 = 0
(4*b+28)/(-2) = 0
(4*b+28)/(-2) = 0 // * -2
4*b+28 = 0
4*b+28 = 0 // - 28
4*b = -28 // : 4
b = -28/4
b = -7
b = -7
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