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a in (-oo:+oo)
3*(6*a+8) = -192 // + 192
3*(6*a+8)+192 = 0
3*(6*a+8)+192 = 0
18*a+216 = 0
18*a+216 = 0
18*a+216 = 0 // - 216
18*a = -216 // : 18
a = -216/18
a = -12
a = -12
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