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b in (-oo:+oo)
(4/5)*b+6 = (9/10)*b // - (9/10)*b
(4/5)*b-((9/10)*b)+6 = 0
(4/5)*b+(-9/10)*b+6 = 0
6-1/10*b = 0 // - 6
-1/10*b = -6 // : -1/10
b = -6/(-1/10)
b = 60
b = 60
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