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b in (-oo:+oo)
-37/5 = -b-b-7 // + -b-b-7
b+b-37/5+7 = 0
2*b-2/5 = 0 // + 2/5
2*b = 2/5 // : 2
b = 2/5/2
b = 1/5
b = 1/5
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