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b in (-oo:+oo)
3*b+7 = (2*b)/4 // - (2*b)/4
3*b-((2*b)/4)+7 = 0
3*b+(-1/2)*b+7 = 0
5/2*b+7 = 0 // - 7
5/2*b = -7 // : 5/2
b = -7/5/2
b = -14/5
b = -14/5
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