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w in (-oo:+oo)
7*w+6 = 3*w+26 // - 3*w+26
7*w-(3*w)-26+6 = 0
7*w-3*w-26+6 = 0
4*w-20 = 0 // + 20
4*w = 20 // : 4
w = 20/4
w = 5
w = 5
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