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w in (-oo:+oo)
3*(-7*w-4) = -75 // + 75
3*(-7*w-4)+75 = 0
3*(-7*w-4)+75 = 0
63-21*w = 0
63-21*w = 0
63-21*w = 0 // - 63
-21*w = -63 // : -21
w = -63/(-21)
w = 3
w = 3
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