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b in (-oo:+oo)
1.875 = (5/8)*(b-4) // - (5/8)*(b-4)
1.875-((5/8)*(b-4)) = 0
(-5/8)*(b-4)+1.875 = 0
1.875-5/8*(b-4) = 0
1.875-5/8*(b-4) = 0
4.375-5/8*b = 0
4.375-5/8*b = 0
4.375-5/8*b = 0 // - 4.375
-5/8*b = -4.375 // : -5/8
b = -4.375/(-5/8)
b = 7
b = 7
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