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d in (-oo:+oo)
-26 = 6*d+6*d+10 // - 6*d+6*d+10
-(6*d)-(6*d)-26-10 = 0
-6*d-6*d-26-10 = 0
-12*d-36 = 0 // + 36
-12*d = 36 // : -12
d = 36/(-12)
d = -3
d = -3
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