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w in (-oo:+oo)
2*w-((3/5)*w)+10 = 136/15 // - 136/15
2*w-((3/5)*w)-(136/15)+10 = 0
2*w+(-3/5)*w-136/15+10 = 0
7/5*w+14/15 = 0 // - 14/15
7/5*w = -14/15 // : 7/5
w = -14/15/7/5
w = -2/3
w = -2/3
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