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w in (-oo:+oo)
5*(-3*w-6) = -75 // + 75
5*(-3*w-6)+75 = 0
5*(-3*w-6)+75 = 0
45-15*w = 0
45-15*w = 0
45-15*w = 0 // - 45
-15*w = -45 // : -15
w = -45/(-15)
w = 3
w = 3
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