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a in (-oo:+oo)
-42/3 = (2*a)/3+a/3+1/3 // - (2*a)/3+a/3+1/3
-((2*a)/3)-(a/3)-42/3-(1/3) = 0
(-2/3)*a-(a/3)-42/3-1/3 = 0
-a-43/3 = 0 // + 43/3
-a = 43/3 // * -1
a = -43/3
a = -43/3
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