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