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b in (-oo:+oo)
8 = b+2*(-3/4) // - b+2*(-3/4)
8-b-(2*(-3/4)) = 0
3/2-b+8 = 0
19/2-b = 0 // - 19/2
-b = -19/2 // * -1
b = 19/2
b = 19/2
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