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a in (-oo:+oo)
1 = (1/3)*a-3 // - (1/3)*a-3
1-((1/3)*a)+3 = 0
(-1/3)*a+1+3 = 0
4-1/3*a = 0 // - 4
-1/3*a = -4 // : -1/3
a = -4/(-1/3)
a = 12
a = 12
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