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w in (-oo:+oo)
2*w+10 = 65-3*w // - 65-3*w
2*w-(-3*w)-65+10 = 0
2*w+3*w-65+10 = 0
5*w-55 = 0 // + 55
5*w = 55 // : 5
w = 55/5
w = 11
w = 11
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