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w in (-oo:+oo)
7*w-4 = 4*w-13 // - 4*w-13
7*w-(4*w)-4+13 = 0
7*w-4*w-4+13 = 0
3*w+9 = 0 // - 9
3*w = -9 // : 3
w = -9/3
w = -3
w = -3
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