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w in (-oo:+oo)
6*(2-5*w) = 282 // - 282
6*(2-5*w)-282 = 0
6*(2-5*w)-282 = 0
-30*w-270 = 0
-30*w-270 = 0
-30*w-270 = 0 // + 270
-30*w = 270 // : -30
w = 270/(-30)
w = -9
w = -9
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