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w in (-oo:+oo)
4-6*w = 7*w-48 // - 7*w-48
4-6*w-(7*w)+48 = 0
4-6*w-7*w+48 = 0
52-13*w = 0 // - 52
-13*w = -52 // : -13
w = -52/(-13)
w = 4
w = 4
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