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b in (-oo:+oo)
7-((4*b)/7) = -3 // + 3
3-((4*b)/7)+7 = 0
(-4/7)*b+3+7 = 0
10-4/7*b = 0 // - 10
-4/7*b = -10 // : -4/7
b = -10/(-4/7)
b = 35/2
b = 35/2
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