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b in (-oo:+oo)
(1/4)*(4*b+12) = 7*b-b-12 // - 7*b-b-12
(1/4)*(4*b+12)-(7*b)+b+12 = 0
(1/4)*(4*b+12)-7*b+b+12 = 0
1/4*(4*b+12)-7*b+b+12 = 0
1/4*(4*b+12)-7*b+b+12 = 0
b-6*b+3+12 = 0
3-5*b+12 = 0
15-5*b = 0
15-5*b = 0
15-5*b = 0 // - 15
-5*b = -15 // : -5
b = -15/(-5)
b = 3
b = 3
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