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b in (-oo:+oo)
-28 = 4*b-(7*b)+8 // - 4*b-(7*b)+8
7*b-(4*b)-28-8 = 0
7*b-4*b-28-8 = 0
3*b-36 = 0 // + 36
3*b = 36 // : 3
b = 36/3
b = 12
b = 12
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