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w in (-oo:+oo)
6 = w-3*w+10 // - w-3*w+10
6-(-3*w)-w-10 = 0
3*w-w-10+6 = 0
2*w-4 = 0 // + 4
2*w = 4 // : 2
w = 4/2
w = 2
w = 2
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