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b in (-oo:+oo)
(-3/5)*b+(2/5)*b+7 = 19 // - 19
(-3/5)*b+(2/5)*b-19+7 = 0
-1/5*b-12 = 0 // + 12
-1/5*b = 12 // : -1/5
b = 12/(-1/5)
b = -60
b = -60
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