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w in (-oo:+oo)
5*w-(3*w)+3 = 21 // - 21
5*w-(3*w)-21+3 = 0
5*w-3*w-21+3 = 0
2*w-18 = 0 // + 18
2*w = 18 // : 2
w = 18/2
w = 9
w = 9
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