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b in (-oo:+oo)
(2/15)*b-((3/5)*b) = 35 // - 35
(2/15)*b-((3/5)*b)-35 = 0
(2/15)*b+(-3/5)*b-35 = 0
-7/15*b-35 = 0 // + 35
-7/15*b = 35 // : -7/15
b = 35/(-7/15)
b = -75
b = -75
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