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b in (-oo:+oo)
(2/5)*b-((2/3)*b)+2 = 26/5 // - 26/5
(2/5)*b-((2/3)*b)-(26/5)+2 = 0
(2/5)*b+(-2/3)*b-26/5+2 = 0
-4/15*b-16/5 = 0 // + 16/5
-4/15*b = 16/5 // : -4/15
b = 16/5/(-4/15)
b = -12
b = -12
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