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b in (-oo:+oo)
b/19-((7*b)/19) = 30/19 // - 30/19
b/19-((7*b)/19)-(30/19) = 0
b/19+(-7/19)*b-30/19 = 0
-6/19*b-30/19 = 0 // + 30/19
-6/19*b = 30/19 // : -6/19
b = 30/19/(-6/19)
b = -5
b = -5
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