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a in (-oo:+oo)
2-((5/6)*a)-(6*a) = -39 // + 39
2-((5/6)*a)-(6*a)+39 = 0
(-5/6)*a-6*a+2+39 = 0
41-41/6*a = 0 // - 41
-41/6*a = -41 // : -41/6
a = -41/(-41/6)
a = 6
a = 6
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