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w in (-oo:+oo)
3*w-10 = 4*w-14 // - 4*w-14
3*w-(4*w)-10+14 = 0
3*w-4*w-10+14 = 0
4-w = 0 // - 4
-w = -4 // * -1
w = 4
w = 4
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