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b in (-oo:+oo)
-10 = -b/4 // + -b/4
-(-b/4)-10 = 0
(1/4)*b-10 = 0
1/4*b-10 = 0 // + 10
1/4*b = 10 // : 1/4
b = 10/1/4
b = 40
b = 40
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