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w in (-oo:+oo)
2*w-3 = 5*w-12 // - 5*w-12
2*w-(5*w)-3+12 = 0
2*w-5*w-3+12 = 0
9-3*w = 0 // - 9
-3*w = -9 // : -3
w = -9/(-3)
w = 3
w = 3
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