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a in (-oo:+oo)
a+(1/7)*a+5/6 = 199/210 // - 199/210
a+(1/7)*a+5/6-(199/210) = 0
a+(1/7)*a+5/6-199/210 = 0
8/7*a-4/35 = 0 // + 4/35
8/7*a = 4/35 // : 8/7
a = 4/35/8/7
a = 1/10
a = 1/10
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