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w in (-oo:+oo)
2*w-(3*w)+3 = 7 // - 7
2*w-(3*w)-7+3 = 0
2*w-3*w-7+3 = 0
-w-4 = 0 // + 4
-w = 4 // * -1
w = -4
w = -4
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