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b in (-oo:+oo)
5 = (1/4)*(12*b+8) // - (1/4)*(12*b+8)
5-((1/4)*(12*b+8)) = 0
(-1/4)*(12*b+8)+5 = 0
5-1/4*(12*b+8) = 0
5-1/4*(12*b+8) = 0
3-3*b = 0
3-3*b = 0
3-3*b = 0 // - 3
-3*b = -3 // : -3
b = -3/(-3)
b = 1
b = 1
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