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b in (-oo:+oo)
-5*b-((2/3)*b)-8 = -80/27 // + -80/27
-5*b-((2/3)*b)-(-80/27)-8 = 0
(-2/3)*b-5*b+80/27-8 = 0
-17/3*b-136/27 = 0 // + 136/27
-17/3*b = 136/27 // : -17/3
b = 136/27/(-17/3)
b = -8/9
b = -8/9
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