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b in (-oo:+oo)
b/13-((7*b)/13) = 18/13 // - 18/13
b/13-((7*b)/13)-(18/13) = 0
b/13+(-7/13)*b-18/13 = 0
-6/13*b-18/13 = 0 // + 18/13
-6/13*b = 18/13 // : -6/13
b = 18/13/(-6/13)
b = -3
b = -3
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