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a in (-oo:+oo)
(-1/3)*(6*a+3) = 6 // - 6
(-1/3)*(6*a+3)-6 = 0
-1/3*(6*a+3)-6 = 0
-1/3*(6*a+3)-6 = 0
-2*a-7 = 0
-2*a-7 = 0
-2*a-7 = 0 // + 7
-2*a = 7 // : -2
a = 7/(-2)
a = -7/2
a = -7/2
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