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b in (-oo:+oo)
(7*b)/5+4 = 6*b-203 // - 6*b-203
(7*b)/5-(6*b)+4+203 = 0
(7*b)/5-6*b+4+203 = 0
207-23/5*b = 0 // - 207
-23/5*b = -207 // : -23/5
b = -207/(-23/5)
b = 45
b = 45
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