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w in (-oo:+oo)
-2*w-(3/10) = -143/10 // + -143/10
-2*w-(3/10)-(-143/10) = 0
143/10-2*w-3/10 = 0
14-2*w = 0 // - 14
-2*w = -14 // : -2
w = -14/(-2)
w = 7
w = 7
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