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w in (-oo:+oo)
6*(-2*w-10) = 60 // - 60
6*(-2*w-10)-60 = 0
6*(-2*w-10)-60 = 0
-12*w-120 = 0
-12*w-120 = 0
-12*w-120 = 0 // + 120
-12*w = 120 // : -12
w = 120/(-12)
w = -10
w = -10
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