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r in (-oo:+oo)
(2/3)*(12*r+18)^32 = 0
2/3*(12*r+18)^32 = 0
12*r+18 = 0 // - 18
12*r = -18 // : 12
r = -18/12
r = -3/2
r in { -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2, -3/2 }
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