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b in (-oo:+oo)
-b-((3/5)*b)-(4/5) = -76/5 // + -76/5
-b-((3/5)*b)-(4/5)-(-76/5) = 0
(-3/5)*b-b-4/5+76/5 = 0
72/5-8/5*b = 0 // - 72/5
-8/5*b = -72/5 // : -8/5
b = -72/5/(-8/5)
b = 9
b = 9
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