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b in (-oo:+oo)
(2*(5-(6*b)))/4 = 13-((15*b)/5) // - 13-((15*b)/5)
(2*(5-(6*b)))/4+(15*b)/5-13 = 0
(2*(5-6*b))/4+(15*b)/5-13 = 0
(2*(5-6*b))/4+3*b-13 = 0
(2*(5-6*b))/4+(3*4*b)/4+(-13*4)/4 = 0
2*(5-6*b)+3*4*b-13*4 = 0
10-52 = 0
-42 = 0
-42/4 = 0
-42/4 = 0 // * 4
-42 = 0
-42 = 0
b belongs to the empty set
b belongs to the empty set
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