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b in (-oo:+oo)
(3/10)*b-((1/10)*b)+10 = 0
(3/10)*b+(-1/10)*b+10 = 0
1/5*b+10 = 0 // - 10
1/5*b = -10 // : 1/5
b = -10/1/5
b = -50
b = -50
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