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w in (-oo:+oo)
5*w+3 = 2*w+30 // - 2*w+30
5*w-(2*w)-30+3 = 0
5*w-2*w-30+3 = 0
3*w-27 = 0 // + 27
3*w = 27 // : 3
w = 27/3
w = 9
w = 9
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