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w in (-oo:+oo)
(-1/3)*w-((1/5)*w)-10 = -782/75 // + -782/75
(-1/3)*w-((1/5)*w)-(-782/75)-10 = 0
(-1/3)*w+(-1/5)*w+782/75-10 = 0
32/75-8/15*w = 0 // - 32/75
-8/15*w = -32/75 // : -8/15
w = -32/75/(-8/15)
w = 4/5
w = 4/5
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