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w in (-oo:+oo)
7*w-5 = 28-4*w // - 28-4*w
7*w-(-4*w)-28-5 = 0
7*w+4*w-28-5 = 0
11*w-33 = 0 // + 33
11*w = 33 // : 11
w = 33/11
w = 3
w = 3
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