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a in (-oo:+oo)
((-3/10)*a^1)/3 = -2 // + 2
((-3/10)*a^1)/3+2 = 0
((-3/10)*a)/3+2 = 0
2-1/10*a = 0 // - 2
-1/10*a = -2 // : -1/10
a = -2/(-1/10)
a = 20
a = 20
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