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w in (-oo:+oo)
7*w+6 = 3*w+2 // - 3*w+2
7*w-(3*w)-2+6 = 0
7*w-3*w-2+6 = 0
4*w+4 = 0 // - 4
4*w = -4 // : 4
w = -4/4
w = -1
w = -1
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