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w in (-oo:+oo)
-4*w-7 = 5*w-52 // - 5*w-52
52-4*w-(5*w)-7 = 0
52-4*w-5*w-7 = 0
45-9*w = 0 // - 45
-9*w = -45 // : -9
w = -45/(-9)
w = 5
w = 5
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