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w in (-oo:+oo)
(-3/5)*w-(3/10) = -39/10 // + -39/10
(-3/5)*w-(3/10)-(-39/10) = 0
(-3/5)*w-3/10+39/10 = 0
18/5-3/5*w = 0 // - 18/5
-3/5*w = -18/5 // : -3/5
w = -18/5/(-3/5)
w = 6
w = 6
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