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a in (-oo:+oo)
-((5/6)*a)-1/6 = 49/6 // - 49/6
-((5/6)*a)-1/6-(49/6) = 0
(-5/6)*a-1/6-49/6 = 0
-5/6*a-25/3 = 0 // + 25/3
-5/6*a = 25/3 // : -5/6
a = 25/3/(-5/6)
a = -10
a = -10
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